Synopsis
#include <inavr.h>
unsigned char __disable_interrupt(void);
Description

__disable_interrupt disables global interrupts by clearing the I bit in the status register and returns the value of the status register before the I bit is cleared. You can restore the state of the I bit from the value returned from __disable_interrupt by using the __restore_interrupt intrinsic function.

__disable_interrupt is an intrinsic function and produces inline code.

Example
void critical_function(void)
{
  // Disable interrupts and save interrupt enable state
  unsigned char state = __disable_interrupt();

  // Critical processing here

  // Restore interrupt enable state from saved value
  __restore_interrupt(state);
}
Portability

__disable_interrupt can be used on any AVR device.

See Also

__restore_interrupt