NAME

       avr_cpufunc - <avr/cpufunc.h>: Special AVR CPU functions

SYNOPSIS

   Macros
       #define _NOP()
       #define _MemoryBarrier()

   Functions
       void ccp_write_io (uint8_t *__ioaddr, uint8_t __value)

Detailed Description

       #include <avr/cpufunc.h>

       This header file contains macros that access special functions of the AVR CPU which do not
       fit into any of the other header files.

Macro Definition Documentation

   #define _MemoryBarrier()
       Implement a read/write memory barrier. A memory barrier instructs the compiler to not
       cache any memory data in registers beyond the barrier. This can sometimes be more
       effective than blocking certain optimizations by declaring some object with a volatile
       qualifier.

       See Problems with reordering code for things to be taken into account with respect to
       compiler optimizations.

   #define _NOP()
       Execute a no operation (NOP) CPU instruction. This should not be used to implement delays,
       better use the functions from <util/delay_basic.h> or <util/delay.h> for this. For
       debugging purposes, a NOP can be useful to have an instruction that is guaranteed to be
       not optimized away by the compiler, so it can always become a breakpoint in the debugger.

Function Documentation

   void ccp_write_io (uint8_t * __ioaddr, uint8_t __value)
       Write __value to Configuration Change Protected (CCP) IO register at __ioaddr.

Author

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