NAME

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

SYNOPSIS

   Macros
       #define _NOP()
       #define _MemoryBarrier()

   Functions
       void ccp_write_io (volatile uint8_t *__ioaddr, uint8_t __value)
       void ccp_write_spm (volatile 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 (volatile uint8_t * __ioaddr, uint8_t __value)
       Write __value to IO Register Protected (CCP) IO register at __ioaddr. . See also _PROTECTED_WRITE().

   void ccp_write_spm (volatile uint8_t * __ioaddr, uint8_t __value)
       Write __value to SPM Instruction Protected (CCP) IO register at __ioaddr. See also
       _PROTECTED_WRITE_SPM().

Author

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AVR-LibC                                          Version 2.2.1                                avr_cpufunc(3avr)