Provided by: avr-libc_2.0.0+Atmel3.7.0-1_all bug

NAME

       avr_interrupts - <avr/interrupt.h>: Interrupts

SYNOPSIS

   Global manipulation of the interrupt flag
       The global interrupt flag is maintained in the I bit of the status register (SREG).

       Handling interrupts frequently requires attention regarding atomic access to objects that
       could be altered by code running within an interrupt context, see <util/atomic.h>.

       Frequently, interrupts are being disabled for periods of time in order to perform certain
       operations without being disturbed; see Problems with reordering code for things to be
       taken into account with respect to compiler optimizations.
       #define sei()
       #define cli()

   Macros for writing interrupt handler functions
       #define ISR(vector,  attributes)
       #define SIGNAL(vector)
       #define EMPTY_INTERRUPT(vector)
       #define ISR_ALIAS(vector,  target_vector)
       #define reti()
       #define BADISR_vect

   ISR attributes
       #define ISR_BLOCK
       #define ISR_NOBLOCK
       #define ISR_NAKED
       #define ISR_ALIASOF(target_vector)

Detailed Description

       Note
           This discussion of interrupts was originally taken from Rich Neswold's document. See
           Acknowledgments.

   Introduction to avr-libc's interrupt handling
       It's nearly impossible to find compilers that agree on how to handle interrupt code. Since
       the C language tries to stay away from machine dependent details, each compiler writer is
       forced to design their method of support.

       In the AVR-GCC environment, the vector table is predefined to point to interrupt routines
       with predetermined names. By using the appropriate name, your routine will be called when
       the corresponding interrupt occurs. The device library provides a set of default interrupt
       routines, which will get used if you don't define your own.

       Patching into the vector table is only one part of the problem. The compiler uses, by
       convention, a set of registers when it's normally executing compiler-generated code. It's
       important that these registers, as well as the status register, get saved and restored.
       The extra code needed to do this is enabled by tagging the interrupt function with
       __attribute__((signal)).

       These details seem to make interrupt routines a little messy, but all these details are
       handled by the Interrupt API. An interrupt routine is defined with ISR(). This macro
       register and mark the routine as an interrupt handler for the specified peripheral. The
       following is an example definition of a handler for the ADC interrupt.

       #include <avr/interrupt.h>

       ISR(ADC_vect)
       {
           // user code here
       }

       Refer to the chapter explaining assembler programming for an explanation about interrupt
       routines written solely in assembler language.

   Catch-all interrupt vector
       If an unexpected interrupt occurs (interrupt is enabled and no handler is installed, which
       usually indicates a bug), then the default action is to reset the device by jumping to the
       reset vector. You can override this by supplying a function named BADISR_vect which should
       be defined with ISR() as such. (The name BADISR_vect is actually an alias for
       __vector_default. The latter must be used inside assembly code in case <avr/interrupt.h>
       is not included.)

       #include <avr/interrupt.h>

       ISR(BADISR_vect)
       {
           // user code here
       }

   Nested interrupts
       The AVR hardware clears the global interrupt flag in SREG before entering an interrupt
       vector. Thus, normally interrupts will remain disabled inside the handler until the
       handler exits, where the RETI instruction (that is emitted by the compiler as part of the
       normal function epilogue for an interrupt handler) will eventually re-enable further
       interrupts. For that reason, interrupt handlers normally do not nest. For most interrupt
       handlers, this is the desired behaviour, for some it is even required in order to prevent
       infinitely recursive interrupts (like UART interrupts, or level-triggered external
       interrupts). In rare circumstances though it might be desired to re-enable the global
       interrupt flag as early as possible in the interrupt handler, in order to not defer any
       other interrupt more than absolutely needed. This could be done using an sei() instruction
       right at the beginning of the interrupt handler, but this still leaves few instructions
       inside the compiler-generated function prologue to run with global interrupts disabled.
       The compiler can be instructed to insert an SEI instruction right at the beginning of an
       interrupt handler by declaring the handler the following way:

       ISR(XXX_vect, ISR_NOBLOCK)
       {
         ...
       }

       where XXX_vect is the name of a valid interrupt vector for the MCU type in question, as
       explained below.

   Two vectors sharing the same code
       In some circumstances, the actions to be taken upon two different interrupts might be
       completely identical so a single implementation for the ISR would suffice. For example,
       pin-change interrupts arriving from two different ports could logically signal an event
       that is independent from the actual port (and thus interrupt vector) where it happened.
       Sharing interrupt vector code can be accomplished using the ISR_ALIASOF() attribute to the
       ISR macro:

       ISR(PCINT0_vect)
       {
         ...
         // Code to handle the event.
       }

       ISR(PCINT1_vect, ISR_ALIASOF(PCINT0_vect));

       Note
           There is no body to the aliased ISR.

       Note that the ISR_ALIASOF() feature requires GCC 4.2 or above (or a patched version of GCC
       4.1.x). See the documentation of the ISR_ALIAS() macro for an implementation which is less
       elegant but could be applied to all compiler versions.

   Empty interrupt service routines
       In rare circumstances, in interrupt vector does not need any code to be implemented at
       all. The vector must be declared anyway, so when the interrupt triggers it won't execute
       the BADISR_vect code (which by default restarts the application).

       This could for example be the case for interrupts that are solely enabled for the purpose
       of getting the controller out of sleep_mode().

       A handler for such an interrupt vector can be declared using the EMPTY_INTERRUPT() macro:

       EMPTY_INTERRUPT(ADC_vect);

       Note
           There is no body to this macro.

   Manually defined ISRs
       In some circumstances, the compiler-generated prologue and epilogue of the ISR might not
       be optimal for the job, and a manually defined ISR could be considered particularly to
       speedup the interrupt handling.

       One solution to this could be to implement the entire ISR as manual assembly code in a
       separate (assembly) file. See Combining C and assembly source files for an example of how
       to implement it that way.

       Another solution is to still implement the ISR in C language but take over the compiler's
       job of generating the prologue and epilogue. This can be done using the ISR_NAKED
       attribute to the ISR() macro. Note that the compiler does not generate anything as
       prologue or epilogue, so the final reti() must be provided by the actual implementation.
       SREG must be manually saved if the ISR code modifies it, and the compiler-implied
       assumption of __zero_reg__ always being 0 could be wrong (e. g. when interrupting right
       after of a MUL instruction).

       ISR(TIMER1_OVF_vect, ISR_NAKED)
       {
         PORTB |= _BV(0);  // results in SBI which does not affect SREG
         reti();
       }

   Choosing the vector: Interrupt vector names
       The interrupt is chosen by supplying one of the symbols in following table.

       There are currently two different styles present for naming the vectors. One form uses
       names starting with SIG_, followed by a relatively verbose but arbitrarily chosen name
       describing the interrupt vector. This has been the only available style in avr-libc up to
       version 1.2.x.

       Starting with avr-libc version 1.4.0, a second style of interrupt vector names has been
       added, where a short phrase for the vector description is followed by _vect. The short
       phrase matches the vector name as described in the datasheet of the respective device (and
       in Atmel's XML files), with spaces replaced by an underscore and other non-alphanumeric
       characters dropped. Using the suffix _vect is intented to improve portability to other C
       compilers available for the AVR that use a similar naming convention.

       The historical naming style might become deprecated in a future release, so it is not
       recommended for new projects.

       Note
           The ISR() macro cannot really spell-check the argument passed to them. Thus, by
           misspelling one of the names below in a call to ISR(), a function will be created
           that, while possibly being usable as an interrupt function, is not actually wired into
           the interrupt vector table. The compiler will generate a warning if it detects a
           suspiciously looking name of a ISR() function (i.e. one that after macro replacement
           does not start with '__vector_').

        Vector name Old vector name Description Applicable for device

       ADC_vect SIG_ADC ADC Conversion Complete AT90S2333, AT90S4433, AT90S4434, AT90S8535,
       AT90PWM216, AT90PWM2B, AT90PWM316, AT90PWM3B, AT90PWM3, AT90PWM2, AT90PWM1, AT90CAN128,
       AT90CAN32, AT90CAN64, ATmega103, ATmega128, ATmega1284P, ATmega16, ATmega163, ATmega165,
       ATmega165P, ATmega168P, ATmega169, ATmega169P, ATmega32, ATmega323, ATmega325, ATmega3250,
       ATmega3250P, ATmega328P, ATmega329, ATmega3290, ATmega3290P, ATmega48P, ATmega64,
       ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega8, ATmega8535, ATmega88P, ATmega168,
       ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P,
       ATmega164P, ATmega644P, ATmega644, ATtiny13, ATtiny15, ATtiny26, ATtiny43U, ATtiny48,
       ATtiny24, ATtiny44, ATtiny84, ATtiny45, ATtiny25, ATtiny85, ATtiny261, ATtiny461,
       ATtiny861, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  ANALOG_COMP_0_vect
       SIG_COMPARATOR0 Analog Comparator 0 AT90PWM3, AT90PWM2, AT90PWM1  ANALOG_COMP_1_vect
       SIG_COMPARATOR1 Analog Comparator 1 AT90PWM3, AT90PWM2, AT90PWM1  ANALOG_COMP_2_vect
       SIG_COMPARATOR2 Analog Comparator 2 AT90PWM3, AT90PWM2, AT90PWM1  ANALOG_COMP_vect
       SIG_COMPARATOR Analog Comparator AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128,
       ATmega1284P, ATmega165, ATmega165P, ATmega168P, ATmega169, ATmega169P, ATmega325,
       ATmega3250, ATmega3250P, ATmega328P, ATmega329, ATmega3290, ATmega3290P, ATmega48P,
       ATmega64, ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega88P, ATmega168, ATmega48,
       ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P,
       ATmega164P, ATmega644P, ATmega644, AT90USB162, AT90USB82, AT90USB1287, AT90USB1286,
       AT90USB647, AT90USB646  ANA_COMP_vect SIG_COMPARATOR Analog Comparator AT90S1200,
       AT90S2313, AT90S2333, AT90S4414, AT90S4433, AT90S4434, AT90S8515, AT90S8535, ATmega16,
       ATmega161, ATmega162, ATmega163, ATmega32, ATmega323, ATmega8, ATmega8515, ATmega8535,
       ATtiny11, ATtiny12, ATtiny13, ATtiny15, ATtiny2313, ATtiny26, ATtiny28, ATtiny43U,
       ATtiny48, ATtiny24, ATtiny44, ATtiny84, ATtiny45, ATtiny25, ATtiny85, ATtiny261,
       ATtiny461, ATtiny861  CANIT_vect SIG_CAN_INTERRUPT1 CAN Transfer Complete or Error
       AT90CAN128, AT90CAN32, AT90CAN64  EEPROM_READY_vect SIG_EEPROM_READY, SIG_EE_READY
       ATtiny2313  EE_RDY_vect SIG_EEPROM_READY EEPROM Ready AT90S2333, AT90S4433, AT90S4434,
       AT90S8535, ATmega16, ATmega161, ATmega162, ATmega163, ATmega32, ATmega323, ATmega8,
       ATmega8515, ATmega8535, ATtiny12, ATtiny13, ATtiny15, ATtiny26, ATtiny43U, ATtiny48,
       ATtiny24, ATtiny44, ATtiny84, ATtiny45, ATtiny25, ATtiny85, ATtiny261, ATtiny461,
       ATtiny861  EE_READY_vect SIG_EEPROM_READY EEPROM Ready AT90PWM3, AT90PWM2, AT90PWM1,
       AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128, ATmega1284P, ATmega165,
       ATmega165P, ATmega168P, ATmega169, ATmega169P, ATmega325, ATmega3250, ATmega3250P,
       ATmega328P, ATmega329, ATmega3290, ATmega3290P, ATmega32HVB, ATmega406, ATmega48P,
       ATmega64, ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega88P, ATmega168, ATmega48,
       ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P,
       ATmega164P, ATmega644P, ATmega644, ATmega16HVA, AT90USB162, AT90USB82, AT90USB1287,
       AT90USB1286, AT90USB647, AT90USB646  EXT_INT0_vect SIG_INTERRUPT0 External Interrupt
       Request 0 ATtiny24, ATtiny44, ATtiny84  INT0_vect SIG_INTERRUPT0 External Interrupt 0
       AT90S1200, AT90S2313, AT90S2323, AT90S2333, AT90S2343, AT90S4414, AT90S4433, AT90S4434,
       AT90S8515, AT90S8535, AT90PWM216, AT90PWM2B, AT90PWM316, AT90PWM3B, AT90PWM3, AT90PWM2,
       AT90PWM1, AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128, ATmega1284P, ATmega16,
       ATmega161, ATmega162, ATmega163, ATmega165, ATmega165P, ATmega168P, ATmega169, ATmega169P,
       ATmega32, ATmega323, ATmega325, ATmega3250, ATmega3250P, ATmega328P, ATmega329,
       ATmega3290, ATmega3290P, ATmega32HVB, ATmega406, ATmega48P, ATmega64, ATmega645,
       ATmega6450, ATmega649, ATmega6490, ATmega8, ATmega8515, ATmega8535, ATmega88P, ATmega168,
       ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P,
       ATmega164P, ATmega644P, ATmega644, ATmega16HVA, ATtiny11, ATtiny12, ATtiny13, ATtiny15,
       ATtiny22, ATtiny2313, ATtiny26, ATtiny28, ATtiny43U, ATtiny48, ATtiny45, ATtiny25,
       ATtiny85, ATtiny261, ATtiny461, ATtiny861, AT90USB162, AT90USB82, AT90USB1287,
       AT90USB1286, AT90USB647, AT90USB646  INT1_vect SIG_INTERRUPT1 External Interrupt Request 1
       AT90S2313, AT90S2333, AT90S4414, AT90S4433, AT90S4434, AT90S8515, AT90S8535, AT90PWM216,
       AT90PWM2B, AT90PWM316, AT90PWM3B, AT90PWM3, AT90PWM2, AT90PWM1, AT90CAN128, AT90CAN32,
       AT90CAN64, ATmega103, ATmega128, ATmega1284P, ATmega16, ATmega161, ATmega162, ATmega163,
       ATmega168P, ATmega32, ATmega323, ATmega328P, ATmega32HVB, ATmega406, ATmega48P, ATmega64,
       ATmega8, ATmega8515, ATmega8535, ATmega88P, ATmega168, ATmega48, ATmega88, ATmega640,
       ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P, ATmega164P, ATmega644P,
       ATmega644, ATmega16HVA, ATtiny2313, ATtiny28, ATtiny48, ATtiny261, ATtiny461, ATtiny861,
       AT90USB162, AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  INT2_vect
       SIG_INTERRUPT2 External Interrupt Request 2 AT90PWM3, AT90PWM2, AT90PWM1, AT90CAN128,
       AT90CAN32, AT90CAN64, ATmega103, ATmega128, ATmega1284P, ATmega16, ATmega161, ATmega162,
       ATmega32, ATmega323, ATmega32HVB, ATmega406, ATmega64, ATmega8515, ATmega8535, ATmega640,
       ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P, ATmega164P, ATmega644P,
       ATmega644, ATmega16HVA, AT90USB162, AT90USB82, AT90USB1287, AT90USB1286, AT90USB647,
       AT90USB646  INT3_vect SIG_INTERRUPT3 External Interrupt Request 3 AT90PWM3, AT90PWM2,
       AT90PWM1, AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128, ATmega32HVB, ATmega406,
       ATmega64, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, AT90USB162,
       AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  INT4_vect SIG_INTERRUPT4
       External Interrupt Request 4 AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128,
       ATmega64, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, AT90USB162,
       AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  INT5_vect SIG_INTERRUPT5
       External Interrupt Request 5 AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128,
       ATmega64, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, AT90USB162,
       AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  INT6_vect SIG_INTERRUPT6
       External Interrupt Request 6 AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128,
       ATmega64, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, AT90USB162,
       AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  INT7_vect SIG_INTERRUPT7
       External Interrupt Request 7 AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128,
       ATmega64, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, AT90USB162,
       AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  IO_PINS_vect SIG_PIN,
       SIG_PIN_CHANGE External Interrupt Request 0 ATtiny11, ATtiny12, ATtiny15, ATtiny26
       LCD_vect SIG_LCD LCD Start of Frame ATmega169, ATmega169P, ATmega329, ATmega3290,
       ATmega3290P, ATmega649, ATmega6490  LOWLEVEL_IO_PINS_vect SIG_PIN Low-level Input on Port
       B ATtiny28  OVRIT_vect SIG_CAN_OVERFLOW1 CAN Timer Overrun AT90CAN128, AT90CAN32,
       AT90CAN64  PCINT0_vect SIG_PIN_CHANGE0 Pin Change Interrupt Request 0 ATmega162,
       ATmega165, ATmega165P, ATmega168P, ATmega169, ATmega169P, ATmega325, ATmega3250,
       ATmega3250P, ATmega328P, ATmega329, ATmega3290, ATmega3290P, ATmega32HVB, ATmega406,
       ATmega48P, ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega88P, ATmega168, ATmega48,
       ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P,
       ATmega164P, ATmega644P, ATmega644, ATtiny13, ATtiny43U, ATtiny48, ATtiny24, ATtiny44,
       ATtiny84, ATtiny45, ATtiny25, ATtiny85, AT90USB162, AT90USB82, AT90USB1287, AT90USB1286,
       AT90USB647, AT90USB646  PCINT1_vect SIG_PIN_CHANGE1 Pin Change Interrupt Request 1
       ATmega162, ATmega165, ATmega165P, ATmega168P, ATmega169, ATmega169P, ATmega325,
       ATmega3250, ATmega3250P, ATmega328P, ATmega329, ATmega3290, ATmega3290P, ATmega32HVB,
       ATmega406, ATmega48P, ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega88P, ATmega168,
       ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P,
       ATmega164P, ATmega644P, ATmega644, ATtiny43U, ATtiny48, ATtiny24, ATtiny44, ATtiny84,
       AT90USB162, AT90USB82  PCINT2_vect SIG_PIN_CHANGE2 Pin Change Interrupt Request 2
       ATmega3250, ATmega3250P, ATmega328P, ATmega3290, ATmega3290P, ATmega48P, ATmega6450,
       ATmega6490, ATmega88P, ATmega168, ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281,
       ATmega2560, ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644, ATtiny48
       PCINT3_vect SIG_PIN_CHANGE3 Pin Change Interrupt Request 3 ATmega3250, ATmega3250P,
       ATmega3290, ATmega3290P, ATmega6450, ATmega6490, ATmega324P, ATmega164P, ATmega644P,
       ATmega644, ATtiny48  PCINT_vect SIG_PIN_CHANGE, SIG_PCINT ATtiny2313, ATtiny261,
       ATtiny461, ATtiny861  PSC0_CAPT_vect SIG_PSC0_CAPTURE PSC0 Capture Event AT90PWM3,
       AT90PWM2, AT90PWM1  PSC0_EC_vect SIG_PSC0_END_CYCLE PSC0 End Cycle AT90PWM3, AT90PWM2,
       AT90PWM1  PSC1_CAPT_vect SIG_PSC1_CAPTURE PSC1 Capture Event AT90PWM3, AT90PWM2, AT90PWM1
       PSC1_EC_vect SIG_PSC1_END_CYCLE PSC1 End Cycle AT90PWM3, AT90PWM2, AT90PWM1
       PSC2_CAPT_vect SIG_PSC2_CAPTURE PSC2 Capture Event AT90PWM3, AT90PWM2, AT90PWM1
       PSC2_EC_vect SIG_PSC2_END_CYCLE PSC2 End Cycle AT90PWM3, AT90PWM2, AT90PWM1  SPI_STC_vect
       SIG_SPI Serial Transfer Complete AT90S2333, AT90S4414, AT90S4433, AT90S4434, AT90S8515,
       AT90S8535, AT90PWM216, AT90PWM2B, AT90PWM316, AT90PWM3B, AT90PWM3, AT90PWM2, AT90PWM1,
       AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128, ATmega1284P, ATmega16, ATmega161,
       ATmega162, ATmega163, ATmega165, ATmega165P, ATmega168P, ATmega169, ATmega169P, ATmega32,
       ATmega323, ATmega325, ATmega3250, ATmega3250P, ATmega328P, ATmega329, ATmega3290,
       ATmega3290P, ATmega32HVB, ATmega48P, ATmega64, ATmega645, ATmega6450, ATmega649,
       ATmega6490, ATmega8, ATmega8515, ATmega8535, ATmega88P, ATmega168, ATmega48, ATmega88,
       ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P, ATmega164P,
       ATmega644P, ATmega644, ATmega16HVA, ATtiny48, AT90USB162, AT90USB82, AT90USB1287,
       AT90USB1286, AT90USB647, AT90USB646  SPM_RDY_vect SIG_SPM_READY Store Program Memory Ready
       ATmega16, ATmega162, ATmega32, ATmega323, ATmega8, ATmega8515, ATmega8535  SPM_READY_vect
       SIG_SPM_READY Store Program Memory Read AT90PWM3, AT90PWM2, AT90PWM1, AT90CAN128,
       AT90CAN32, AT90CAN64, ATmega128, ATmega1284P, ATmega165, ATmega165P, ATmega168P,
       ATmega169, ATmega169P, ATmega325, ATmega3250, ATmega3250P, ATmega328P, ATmega329,
       ATmega3290, ATmega3290P, ATmega406, ATmega48P, ATmega64, ATmega645, ATmega6450, ATmega649,
       ATmega6490, ATmega88P, ATmega168, ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281,
       ATmega2560, ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644, AT90USB162,
       AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  TIM0_COMPA_vect
       SIG_OUTPUT_COMPARE0A Timer/Counter Compare Match A ATtiny13, ATtiny43U, ATtiny24,
       ATtiny44, ATtiny84, ATtiny45, ATtiny25, ATtiny85  TIM0_COMPB_vect SIG_OUTPUT_COMPARE0B
       Timer/Counter Compare Match B ATtiny13, ATtiny43U, ATtiny24, ATtiny44, ATtiny84, ATtiny45,
       ATtiny25, ATtiny85  TIM0_OVF_vect SIG_OVERFLOW0 Timer/Counter0 Overflow ATtiny13,
       ATtiny43U, ATtiny24, ATtiny44, ATtiny84, ATtiny45, ATtiny25, ATtiny85  TIM1_CAPT_vect
       SIG_INPUT_CAPTURE1 Timer/Counter1 Capture Event ATtiny24, ATtiny44, ATtiny84
       TIM1_COMPA_vect SIG_OUTPUT_COMPARE1A Timer/Counter1 Compare Match A ATtiny24, ATtiny44,
       ATtiny84, ATtiny45, ATtiny25, ATtiny85  TIM1_COMPB_vect SIG_OUTPUT_COMPARE1B
       Timer/Counter1 Compare Match B ATtiny24, ATtiny44, ATtiny84, ATtiny45, ATtiny25, ATtiny85
       TIM1_OVF_vect SIG_OVERFLOW1 Timer/Counter1 Overflow ATtiny24, ATtiny44, ATtiny84,
       ATtiny45, ATtiny25, ATtiny85  TIMER0_CAPT_vect SIG_INPUT_CAPTURE0 ADC Conversion Complete
       ATtiny261, ATtiny461, ATtiny861  TIMER0_COMPA_vect SIG_OUTPUT_COMPARE0A TimerCounter0
       Compare Match A ATmega168, ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281,
       ATmega2560, ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644, ATmega16HVA,
       ATtiny2313, ATtiny48, ATtiny261, ATtiny461, ATtiny861, AT90USB162, AT90USB82, AT90USB1287,
       AT90USB1286, AT90USB647, AT90USB646  TIMER0_COMPB_vect SIG_OUTPUT_COMPARE0B,
       SIG_OUTPUT_COMPARE0_B Timer Counter 0 Compare Match B AT90PWM3, AT90PWM2, AT90PWM1,
       ATmega1284P, ATmega168P, ATmega328P, ATmega32HVB, ATmega48P, ATmega88P, ATmega168,
       ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P,
       ATmega164P, ATmega644P, ATmega644, ATmega16HVA, ATtiny2313, ATtiny48, ATtiny261,
       ATtiny461, ATtiny861, AT90USB162, AT90USB82, AT90USB1287, AT90USB1286, AT90USB647,
       AT90USB646  TIMER0_COMP_A_vect SIG_OUTPUT_COMPARE0A, SIG_OUTPUT_COMPARE0_A Timer/Counter0
       Compare Match A AT90PWM3, AT90PWM2, AT90PWM1  TIMER0_COMP_vect SIG_OUTPUT_COMPARE0
       Timer/Counter0 Compare Match AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128,
       ATmega16, ATmega161, ATmega162, ATmega165, ATmega165P, ATmega169, ATmega169P, ATmega32,
       ATmega323, ATmega325, ATmega3250, ATmega3250P, ATmega329, ATmega3290, ATmega3290P,
       ATmega64, ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega8515, ATmega8535
       TIMER0_OVF0_vect SIG_OVERFLOW0 Timer/Counter0 Overflow AT90S2313, AT90S2323, AT90S2343,
       ATtiny22, ATtiny26  TIMER0_OVF_vect SIG_OVERFLOW0 Timer/Counter0 Overflow AT90S1200,
       AT90S2333, AT90S4414, AT90S4433, AT90S4434, AT90S8515, AT90S8535, AT90PWM216, AT90PWM2B,
       AT90PWM316, AT90PWM3B, AT90PWM3, AT90PWM2, AT90PWM1, AT90CAN128, AT90CAN32, AT90CAN64,
       ATmega103, ATmega128, ATmega1284P, ATmega16, ATmega161, ATmega162, ATmega163, ATmega165,
       ATmega165P, ATmega168P, ATmega169, ATmega169P, ATmega32, ATmega323, ATmega325, ATmega3250,
       ATmega3250P, ATmega328P, ATmega329, ATmega3290, ATmega3290P, ATmega32HVB, ATmega48P,
       ATmega64, ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega8, ATmega8515, ATmega8535,
       ATmega88P, ATmega168, ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560,
       ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644, ATmega16HVA, ATtiny11,
       ATtiny12, ATtiny15, ATtiny2313, ATtiny28, ATtiny48, ATtiny261, ATtiny461, ATtiny861,
       AT90USB162, AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  TIMER1_CAPT1_vect
       SIG_INPUT_CAPTURE1 Timer/Counter1 Capture Event AT90S2313  TIMER1_CAPT_vect
       SIG_INPUT_CAPTURE1 Timer/Counter Capture Event AT90S2333, AT90S4414, AT90S4433, AT90S4434,
       AT90S8515, AT90S8535, AT90PWM216, AT90PWM2B, AT90PWM316, AT90PWM3B, AT90PWM3, AT90PWM2,
       AT90PWM1, AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128, ATmega1284P, ATmega16,
       ATmega161, ATmega162, ATmega163, ATmega165, ATmega165P, ATmega168P, ATmega169, ATmega169P,
       ATmega32, ATmega323, ATmega325, ATmega3250, ATmega3250P, ATmega328P, ATmega329,
       ATmega3290, ATmega3290P, ATmega48P, ATmega64, ATmega645, ATmega6450, ATmega649,
       ATmega6490, ATmega8, ATmega8515, ATmega8535, ATmega88P, ATmega168, ATmega48, ATmega88,
       ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P, ATmega164P,
       ATmega644P, ATmega644, ATtiny2313, ATtiny48, AT90USB162, AT90USB82, AT90USB1287,
       AT90USB1286, AT90USB647, AT90USB646  TIMER1_CMPA_vect SIG_OUTPUT_COMPARE1A Timer/Counter1
       Compare Match 1A ATtiny26  TIMER1_CMPB_vect SIG_OUTPUT_COMPARE1B Timer/Counter1 Compare
       Match 1B ATtiny26  TIMER1_COMP1_vect SIG_OUTPUT_COMPARE1A Timer/Counter1 Compare Match
       AT90S2313  TIMER1_COMPA_vect SIG_OUTPUT_COMPARE1A Timer/Counter1 Compare Match A
       AT90S4414, AT90S4434, AT90S8515, AT90S8535, AT90PWM216, AT90PWM2B, AT90PWM316, AT90PWM3B,
       AT90PWM3, AT90PWM2, AT90PWM1, AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128,
       ATmega1284P, ATmega16, ATmega161, ATmega162, ATmega163, ATmega165, ATmega165P, ATmega168P,
       ATmega169, ATmega169P, ATmega32, ATmega323, ATmega325, ATmega3250, ATmega3250P,
       ATmega328P, ATmega329, ATmega3290, ATmega3290P, ATmega32HVB, ATmega48P, ATmega64,
       ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega8, ATmega8515, ATmega8535, ATmega88P,
       ATmega168, ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561,
       ATmega324P, ATmega164P, ATmega644P, ATmega644, ATmega16HVA, ATtiny2313, ATtiny48,
       ATtiny261, ATtiny461, ATtiny861, AT90USB162, AT90USB82, AT90USB1287, AT90USB1286,
       AT90USB647, AT90USB646  TIMER1_COMPB_vect SIG_OUTPUT_COMPARE1B Timer/Counter1 Compare
       MatchB AT90S4414, AT90S4434, AT90S8515, AT90S8535, AT90PWM216, AT90PWM2B, AT90PWM316,
       AT90PWM3B, AT90PWM3, AT90PWM2, AT90PWM1, AT90CAN128, AT90CAN32, AT90CAN64, ATmega103,
       ATmega128, ATmega1284P, ATmega16, ATmega161, ATmega162, ATmega163, ATmega165, ATmega165P,
       ATmega168P, ATmega169, ATmega169P, ATmega32, ATmega323, ATmega325, ATmega3250,
       ATmega3250P, ATmega328P, ATmega329, ATmega3290, ATmega3290P, ATmega32HVB, ATmega48P,
       ATmega64, ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega8, ATmega8515, ATmega8535,
       ATmega88P, ATmega168, ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560,
       ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644, ATmega16HVA, ATtiny2313,
       ATtiny48, ATtiny261, ATtiny461, ATtiny861, AT90USB162, AT90USB82, AT90USB1287,
       AT90USB1286, AT90USB647, AT90USB646  TIMER1_COMPC_vect SIG_OUTPUT_COMPARE1C Timer/Counter1
       Compare Match C AT90CAN128, AT90CAN32, AT90CAN64, ATmega128, ATmega64, ATmega640,
       ATmega1280, ATmega1281, ATmega2560, ATmega2561, AT90USB162, AT90USB82, AT90USB1287,
       AT90USB1286, AT90USB647, AT90USB646  TIMER1_COMPD_vect SIG_OUTPUT_COMPARE0D Timer/Counter1
       Compare Match D ATtiny261, ATtiny461, ATtiny861  TIMER1_COMP_vect SIG_OUTPUT_COMPARE1A
       Timer/Counter1 Compare Match AT90S2333, AT90S4433, ATtiny15  TIMER1_OVF1_vect
       SIG_OVERFLOW1 Timer/Counter1 Overflow AT90S2313, ATtiny26  TIMER1_OVF_vect SIG_OVERFLOW1
       Timer/Counter1 Overflow AT90S2333, AT90S4414, AT90S4433, AT90S4434, AT90S8515, AT90S8535,
       AT90PWM216, AT90PWM2B, AT90PWM316, AT90PWM3B, AT90PWM3, AT90PWM2, AT90PWM1, AT90CAN128,
       AT90CAN32, AT90CAN64, ATmega103, ATmega128, ATmega1284P, ATmega16, ATmega161, ATmega162,
       ATmega163, ATmega165, ATmega165P, ATmega168P, ATmega169, ATmega169P, ATmega32, ATmega323,
       ATmega325, ATmega3250, ATmega3250P, ATmega328P, ATmega329, ATmega3290, ATmega3290P,
       ATmega32HVB, ATmega48P, ATmega64, ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega8,
       ATmega8515, ATmega8535, ATmega88P, ATmega168, ATmega48, ATmega88, ATmega640, ATmega1280,
       ATmega1281, ATmega2560, ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644,
       ATmega16HVA, ATtiny15, ATtiny2313, ATtiny48, ATtiny261, ATtiny461, ATtiny861, AT90USB162,
       AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  TIMER2_COMPA_vect
       SIG_OUTPUT_COMPARE2A Timer/Counter2 Compare Match A ATmega168, ATmega48, ATmega88,
       ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P, ATmega164P,
       ATmega644P, ATmega644, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  TIMER2_COMPB_vect
       SIG_OUTPUT_COMPARE2B Timer/Counter2 Compare Match A ATmega168, ATmega48, ATmega88,
       ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P, ATmega164P,
       ATmega644P, ATmega644, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  TIMER2_COMP_vect
       SIG_OUTPUT_COMPARE2 Timer/Counter2 Compare Match AT90S4434, AT90S8535, AT90CAN128,
       AT90CAN32, AT90CAN64, ATmega103, ATmega128, ATmega16, ATmega161, ATmega162, ATmega163,
       ATmega165, ATmega165P, ATmega169, ATmega169P, ATmega32, ATmega323, ATmega325, ATmega3250,
       ATmega3250P, ATmega329, ATmega3290, ATmega3290P, ATmega64, ATmega645, ATmega6450,
       ATmega649, ATmega6490, ATmega8, ATmega8535  TIMER2_OVF_vect SIG_OVERFLOW2 Timer/Counter2
       Overflow AT90S4434, AT90S8535, AT90CAN128, AT90CAN32, AT90CAN64, ATmega103, ATmega128,
       ATmega1284P, ATmega16, ATmega161, ATmega162, ATmega163, ATmega165, ATmega165P, ATmega168P,
       ATmega169, ATmega169P, ATmega32, ATmega323, ATmega325, ATmega3250, ATmega3250P,
       ATmega328P, ATmega329, ATmega3290, ATmega3290P, ATmega48P, ATmega64, ATmega645,
       ATmega6450, ATmega649, ATmega6490, ATmega8, ATmega8535, ATmega88P, ATmega168, ATmega48,
       ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P,
       ATmega164P, ATmega644P, ATmega644, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646
       TIMER3_CAPT_vect SIG_INPUT_CAPTURE3 Timer/Counter3 Capture Event AT90CAN128, AT90CAN32,
       AT90CAN64, ATmega128, ATmega1284P, ATmega162, ATmega64, ATmega640, ATmega1280, ATmega1281,
       ATmega2560, ATmega2561, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646
       TIMER3_COMPA_vect SIG_OUTPUT_COMPARE3A Timer/Counter3 Compare Match A AT90CAN128,
       AT90CAN32, AT90CAN64, ATmega128, ATmega1284P, ATmega162, ATmega64, ATmega640, ATmega1280,
       ATmega1281, ATmega2560, ATmega2561, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646
       TIMER3_COMPB_vect SIG_OUTPUT_COMPARE3B Timer/Counter3 Compare Match B AT90CAN128,
       AT90CAN32, AT90CAN64, ATmega128, ATmega1284P, ATmega162, ATmega64, ATmega640, ATmega1280,
       ATmega1281, ATmega2560, ATmega2561, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646
       TIMER3_COMPC_vect SIG_OUTPUT_COMPARE3C Timer/Counter3 Compare Match C AT90CAN128,
       AT90CAN32, AT90CAN64, ATmega128, ATmega64, ATmega640, ATmega1280, ATmega1281, ATmega2560,
       ATmega2561, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  TIMER3_OVF_vect
       SIG_OVERFLOW3 Timer/Counter3 Overflow AT90CAN128, AT90CAN32, AT90CAN64, ATmega128,
       ATmega1284P, ATmega162, ATmega64, ATmega640, ATmega1280, ATmega1281, ATmega2560,
       ATmega2561, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  TIMER4_CAPT_vect
       SIG_INPUT_CAPTURE4 Timer/Counter4 Capture Event ATmega640, ATmega1280, ATmega1281,
       ATmega2560, ATmega2561  TIMER4_COMPA_vect SIG_OUTPUT_COMPARE4A Timer/Counter4 Compare
       Match A ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561  TIMER4_COMPB_vect
       SIG_OUTPUT_COMPARE4B Timer/Counter4 Compare Match B ATmega640, ATmega1280, ATmega1281,
       ATmega2560, ATmega2561  TIMER4_COMPC_vect SIG_OUTPUT_COMPARE4C Timer/Counter4 Compare
       Match C ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561  TIMER4_OVF_vect
       SIG_OVERFLOW4 Timer/Counter4 Overflow ATmega640, ATmega1280, ATmega1281, ATmega2560,
       ATmega2561  TIMER5_CAPT_vect SIG_INPUT_CAPTURE5 Timer/Counter5 Capture Event ATmega640,
       ATmega1280, ATmega1281, ATmega2560, ATmega2561  TIMER5_COMPA_vect SIG_OUTPUT_COMPARE5A
       Timer/Counter5 Compare Match A ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561
       TIMER5_COMPB_vect SIG_OUTPUT_COMPARE5B Timer/Counter5 Compare Match B ATmega640,
       ATmega1280, ATmega1281, ATmega2560, ATmega2561  TIMER5_COMPC_vect SIG_OUTPUT_COMPARE5C
       Timer/Counter5 Compare Match C ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561
       TIMER5_OVF_vect SIG_OVERFLOW5 Timer/Counter5 Overflow ATmega640, ATmega1280, ATmega1281,
       ATmega2560, ATmega2561  TWI_vect SIG_2WIRE_SERIAL 2-wire Serial Interface AT90CAN128,
       AT90CAN32, AT90CAN64, ATmega128, ATmega1284P, ATmega16, ATmega163, ATmega168P, ATmega32,
       ATmega323, ATmega328P, ATmega32HVB, ATmega406, ATmega48P, ATmega64, ATmega8, ATmega8535,
       ATmega88P, ATmega168, ATmega48, ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560,
       ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644, ATtiny48, AT90USB1287,
       AT90USB1286, AT90USB647, AT90USB646  TXDONE_vect SIG_TXDONE Transmission Done, Bit Timer
       Flag 2 Interrupt AT86RF401  TXEMPTY_vect SIG_TXBE Transmit Buffer Empty, Bit Itmer Flag 0
       Interrupt AT86RF401  UART0_RX_vect SIG_UART0_RECV UART0, Rx Complete ATmega161
       UART0_TX_vect SIG_UART0_TRANS UART0, Tx Complete ATmega161  UART0_UDRE_vect SIG_UART0_DATA
       UART0 Data Register Empty ATmega161  UART1_RX_vect SIG_UART1_RECV UART1, Rx Complete
       ATmega161  UART1_TX_vect SIG_UART1_TRANS UART1, Tx Complete ATmega161  UART1_UDRE_vect
       SIG_UART1_DATA UART1 Data Register Empty ATmega161  UART_RX_vect SIG_UART_RECV UART, Rx
       Complete AT90S2313, AT90S2333, AT90S4414, AT90S4433, AT90S4434, AT90S8515, AT90S8535,
       ATmega103, ATmega163, ATmega8515  UART_TX_vect SIG_UART_TRANS UART, Tx Complete AT90S2313,
       AT90S2333, AT90S4414, AT90S4433, AT90S4434, AT90S8515, AT90S8535, ATmega103, ATmega163,
       ATmega8515  UART_UDRE_vect SIG_UART_DATA UART Data Register Empty AT90S2313, AT90S2333,
       AT90S4414, AT90S4433, AT90S4434, AT90S8515, AT90S8535, ATmega103, ATmega163, ATmega8515
       USART0_RXC_vect SIG_USART0_RECV USART0, Rx Complete ATmega162  USART0_RX_vect
       SIG_UART0_RECV USART0, Rx Complete AT90CAN128, AT90CAN32, AT90CAN64, ATmega128,
       ATmega1284P, ATmega165, ATmega165P, ATmega169, ATmega169P, ATmega325, ATmega329, ATmega64,
       ATmega645, ATmega649, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561,
       ATmega324P, ATmega164P, ATmega644P, ATmega644  USART0_TXC_vect SIG_USART0_TRANS USART0, Tx
       Complete ATmega162  USART0_TX_vect SIG_UART0_TRANS USART0, Tx Complete AT90CAN128,
       AT90CAN32, AT90CAN64, ATmega128, ATmega1284P, ATmega165, ATmega165P, ATmega169,
       ATmega169P, ATmega325, ATmega3250, ATmega3250P, ATmega329, ATmega3290, ATmega3290P,
       ATmega64, ATmega645, ATmega6450, ATmega649, ATmega6490, ATmega640, ATmega1280, ATmega1281,
       ATmega2560, ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644  USART0_UDRE_vect
       SIG_UART0_DATA USART0 Data Register Empty AT90CAN128, AT90CAN32, AT90CAN64, ATmega128,
       ATmega1284P, ATmega162, ATmega165, ATmega165P, ATmega169, ATmega169P, ATmega325,
       ATmega329, ATmega64, ATmega645, ATmega649, ATmega640, ATmega1280, ATmega1281, ATmega2560,
       ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644  USART1_RXC_vect SIG_USART1_RECV
       USART1, Rx Complete ATmega162  USART1_RX_vect SIG_UART1_RECV USART1, Rx Complete
       AT90CAN128, AT90CAN32, AT90CAN64, ATmega128, ATmega1284P, ATmega64, ATmega640, ATmega1280,
       ATmega1281, ATmega2560, ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644,
       AT90USB162, AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  USART1_TXC_vect
       SIG_USART1_TRANS USART1, Tx Complete ATmega162  USART1_TX_vect SIG_UART1_TRANS USART1, Tx
       Complete AT90CAN128, AT90CAN32, AT90CAN64, ATmega128, ATmega1284P, ATmega64, ATmega640,
       ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P, ATmega164P, ATmega644P,
       ATmega644, AT90USB162, AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646
       USART1_UDRE_vect SIG_UART1_DATA USART1, Data Register Empty AT90CAN128, AT90CAN32,
       AT90CAN64, ATmega128, ATmega1284P, ATmega162, ATmega64, ATmega640, ATmega1280, ATmega1281,
       ATmega2560, ATmega2561, ATmega324P, ATmega164P, ATmega644P, ATmega644, AT90USB162,
       AT90USB82, AT90USB1287, AT90USB1286, AT90USB647, AT90USB646  USART2_RX_vect
       SIG_USART2_RECV USART2, Rx Complete ATmega640, ATmega1280, ATmega1281, ATmega2560,
       ATmega2561  USART2_TX_vect SIG_USART2_TRANS USART2, Tx Complete ATmega640, ATmega1280,
       ATmega1281, ATmega2560, ATmega2561  USART2_UDRE_vect SIG_USART2_DATA USART2 Data register
       Empty ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561  USART3_RX_vect
       SIG_USART3_RECV USART3, Rx Complete ATmega640, ATmega1280, ATmega1281, ATmega2560,
       ATmega2561  USART3_TX_vect SIG_USART3_TRANS USART3, Tx Complete ATmega640, ATmega1280,
       ATmega1281, ATmega2560, ATmega2561  USART3_UDRE_vect SIG_USART3_DATA USART3 Data register
       Empty ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561  USART_RXC_vect
       SIG_USART_RECV, SIG_UART_RECV USART, Rx Complete ATmega16, ATmega32, ATmega323, ATmega8
       USART_RX_vect SIG_USART_RECV, SIG_UART_RECV USART, Rx Complete AT90PWM3, AT90PWM2,
       AT90PWM1, ATmega168P, ATmega3250, ATmega3250P, ATmega328P, ATmega3290, ATmega3290P,
       ATmega48P, ATmega6450, ATmega6490, ATmega8535, ATmega88P, ATmega168, ATmega48, ATmega88,
       ATtiny2313  USART_TXC_vect SIG_USART_TRANS, SIG_UART_TRANS USART, Tx Complete ATmega16,
       ATmega32, ATmega323, ATmega8  USART_TX_vect SIG_USART_TRANS, SIG_UART_TRANS USART, Tx
       Complete AT90PWM3, AT90PWM2, AT90PWM1, ATmega168P, ATmega328P, ATmega48P, ATmega8535,
       ATmega88P, ATmega168, ATmega48, ATmega88, ATtiny2313  USART_UDRE_vect SIG_USART_DATA,
       SIG_UART_DATA USART Data Register Empty AT90PWM3, AT90PWM2, AT90PWM1, ATmega16,
       ATmega168P, ATmega32, ATmega323, ATmega3250, ATmega3250P, ATmega328P, ATmega3290,
       ATmega3290P, ATmega48P, ATmega6450, ATmega6490, ATmega8, ATmega8535, ATmega88P, ATmega168,
       ATmega48, ATmega88, ATtiny2313  USI_OVERFLOW_vect SIG_USI_OVERFLOW USI Overflow ATmega165,
       ATmega165P, ATmega169, ATmega169P, ATmega325, ATmega3250, ATmega3250P, ATmega329,
       ATmega3290, ATmega3290P, ATmega645, ATmega6450, ATmega649, ATmega6490, ATtiny2313
       USI_OVF_vect SIG_USI_OVERFLOW USI Overflow ATtiny26, ATtiny43U, ATtiny24, ATtiny44,
       ATtiny84, ATtiny45, ATtiny25, ATtiny85, ATtiny261, ATtiny461, ATtiny861  USI_START_vect
       SIG_USI_START USI Start Condition ATmega165, ATmega165P, ATmega169, ATmega169P, ATmega325,
       ATmega3250, ATmega3250P, ATmega329, ATmega3290, ATmega3290P, ATmega645, ATmega6450,
       ATmega649, ATmega6490, ATtiny2313, ATtiny43U, ATtiny45, ATtiny25, ATtiny85, ATtiny261,
       ATtiny461, ATtiny861  USI_STRT_vect SIG_USI_START USI Start ATtiny26  USI_STR_vect
       SIG_USI_START USI START ATtiny24, ATtiny44, ATtiny84  WATCHDOG_vect SIG_WATCHDOG_TIMEOUT
       Watchdog Time-out ATtiny24, ATtiny44, ATtiny84  WDT_OVERFLOW_vect SIG_WATCHDOG_TIMEOUT,
       SIG_WDT_OVERFLOW Watchdog Timer Overflow ATtiny2313  WDT_vect SIG_WDT,
       SIG_WATCHDOG_TIMEOUT Watchdog Timeout Interrupt AT90PWM3, AT90PWM2, AT90PWM1, ATmega1284P,
       ATmega168P, ATmega328P, ATmega32HVB, ATmega406, ATmega48P, ATmega88P, ATmega168, ATmega48,
       ATmega88, ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega324P,
       ATmega164P, ATmega644P, ATmega644, ATmega16HVA, ATtiny13, ATtiny43U, ATtiny48, ATtiny45,
       ATtiny25, ATtiny85, ATtiny261, ATtiny461, ATtiny861, AT90USB162, AT90USB82, AT90USB1287,
       AT90USB1286, AT90USB647, AT90USB646

Macro Definition Documentation

   #define BADISR_vect
       #include <avr/interrupt.h>

       This is a vector which is aliased to __vector_default, the vector executed when an ISR
       fires with no accompanying ISR handler. This may be used along with the ISR() macro to
       create a catch-all for undefined but used ISRs for debugging purposes.

   #define cli()
       Disables all interrupts by clearing the global interrupt mask. This function actually
       compiles into a single line of assembly, so there is no function call overhead. However,
       the macro also implies a memory barrier which can cause additional loss of optimization.

       In order to implement atomic access to multi-byte objects, consider using the macros from
       <util/atomic.h>, rather than implementing them manually with cli() and sei().

   #define EMPTY_INTERRUPT(vector)
       Defines an empty interrupt handler function. This will not generate any prolog or epilog
       code and will only return from the ISR. Do not define a function body as this will define
       it for you. Example:

       EMPTY_INTERRUPT(ADC_vect);

   #define ISR(vector, attributes)
       Introduces an interrupt handler function (interrupt service routine) that runs with global
       interrupts initially disabled by default with no attributes specified.

       The attributes are optional and alter the behaviour and resultant generated code of the
       interrupt routine. Multiple attributes may be used for a single function, with a space
       seperating each attribute.

       Valid attributes are ISR_BLOCK, ISR_NOBLOCK, ISR_NAKED and ISR_ALIASOF(vect).

       vector must be one of the interrupt vector names that are valid for the particular MCU
       type.

   #define ISR_ALIAS(vector, target_vector)
       Aliases a given vector to another one in the same manner as the ISR_ALIASOF attribute for
       the ISR() macro. Unlike the ISR_ALIASOF attribute macro however, this is compatible for
       all versions of GCC rather than just GCC version 4.2 onwards.

       Note
           This macro creates a trampoline function for the aliased macro. This will result in a
           two cycle penalty for the aliased vector compared to the ISR the vector is aliased to,
           due to the JMP/RJMP opcode used.

       Deprecated
           For new code, the use of ISR(..., ISR_ALIASOF(...)) is recommended.

       Example:

       ISR(INT0_vect)
       {
           PORTB = 42;
       }

       ISR_ALIAS(INT1_vect, INT0_vect);

   #define ISR_ALIASOF(target_vector)
       The ISR is linked to another ISR, specified by the vect parameter. This is compatible with
       GCC 4.2 and greater only.

       Use this attribute in the attributes parameter of the ISR macro.

   #define ISR_BLOCK
       Identical to an ISR with no attributes specified. Global interrupts are initially disabled
       by the AVR hardware when entering the ISR, without the compiler modifying this state.

       Use this attribute in the attributes parameter of the ISR macro.

   #define ISR_NAKED
       ISR is created with no prologue or epilogue code. The user code is responsible for
       preservation of the machine state including the SREG register, as well as placing a reti()
       at the end of the interrupt routine.

       Use this attribute in the attributes parameter of the ISR macro.

   #define ISR_NOBLOCK
       ISR runs with global interrupts initially enabled. The interrupt enable flag is activated
       by the compiler as early as possible within the ISR to ensure minimal processing delay for
       nested interrupts.

       This may be used to create nested ISRs, however care should be taken to avoid stack
       overflows, or to avoid infinitely entering the ISR for those cases where the AVR hardware
       does not clear the respective interrupt flag before entering the ISR.

       Use this attribute in the attributes parameter of the ISR macro.

   #define reti()
       Returns from an interrupt routine, enabling global interrupts. This should be the last
       command executed before leaving an ISR defined with the ISR_NAKED attribute.

       This macro actually compiles into a single line of assembly, so there is no function call
       overhead.

   #define sei()
       Enables interrupts by setting the global interrupt mask. This function actually compiles
       into a single line of assembly, so there is no function call overhead. However, the macro
       also implies a memory barrier which can cause additional loss of optimization.

       In order to implement atomic access to multi-byte objects, consider using the macros from
       <util/atomic.h>, rather than implementing them manually with cli() and sei().

   #define SIGNAL(vector)
       Introduces an interrupt handler function that runs with global interrupts initially
       disabled.

       This is the same as the ISR macro without optional attributes.

       Deprecated
           Do not use SIGNAL() in new code. Use ISR() instead.

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