Provided by: avr-libc_2.0.0+Atmel3.6.2-3_all 
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.
Author
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