That comment threw me off also.
The same way you attach interrupts:
attachInterrupt(0, pin2Interrupt, LOW);
you can also detach them:
detachInterrupt(0);
So one can do it in 'arduino code' instead of with the use of 'raw' C code.
For example, I have a remote control, when no key is pressed it goes into sleep mode.
As part of that, it attaches an external interrupt to wake up with, and detaches interrupts so that the key can be read that caused the interrupt:
// * Name: pin2Interrupt, "ISR" to run when interrupted in Sleep Mode
void pin2Interrupt()
{
/* This brings us back from sleep. */
}
//***************************************************
// * Name: enterSleep
void enterSleep()
{
[glow] /* Setup pin2 as an interrupt and attach handler. */
attachInterrupt(0, pin2Interrupt, LOW);[/glow]
delay(50); //
/* the sleep modes
SLEEP_MODE_IDLE - the least power savings
SLEEP_MODE_ADC
SLEEP_MODE_PWR_SAVE
SLEEP_MODE_STANDBY
SLEEP_MODE_PWR_DOWN - the most power savings
*/
set_sleep_mode(SLEEP_MODE_PWR_DOWN); // setting up for sleep ...
sleep_enable(); // setting up for sleep ...
sleep_mode(); // now goes to Sleep and waits for the interrupt
[glow]/* The program will continue from here after the interrupt. */
detachInterrupt(0); //disable interrupts while we get ready to read the keypad [/glow]
/* First thing to do is disable sleep. */
sleep_disable();
// set all the keypad columns back high so can read keypad presses again
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
digitalWrite(9, HIGH);
digitalWrite(10, HIGH);
// then go to the void Loop()
}