Fujitsu ALL Series, Application Note

Page: 15 / 20

EXTERNAL INTERRUPTS
Chapter 4 External Interrupt Examples
© Fujitsu Microelectronics Europe GmbH - 15 - MCU-AN -300203-E-V17
Q
void main ( void )
{
PDR00 = 0x00; // clear port data
DDR00 = 0xFF; // set port 0 to output
Init_extint0();
Init_extint1();
InitIrqLevels();
__set_il(7); // allow all levels
__EI(); // globally enable interrupts
EIRR0_ER1 = 0; // clear ext. int 1 request flag
ENIR0_EN1 = 1; // enable ext. int1
status = RUNMODE;
while (1)
{
if (status == STOPREQUEST) // stop mode request
{
PDR00 = 0x0F;
SMCR = 0x03; // goto stop mode, preserve pin state
}
else // run mode
{
for (i = 0; i < 50000; i++) // wait loop
{
__asm(" NOP");
__asm(" NOP");
}
PDR00++; // show, that MCU is running
}
}
}
// ISR external Int 0
__interrupt void IRQ_extint0 ( void )
{
status = RUNMODE;
EIRR0_ER0 = 0; // clear ext. int 0 request flag
ENIR0_EN0 = 0; // disable ext. int0
EIRR0_ER1 = 0; // clear ext. int 1 request flag
ENIR0_EN1 = 1; // enable ext. int1
}
// ISR external Int 1
__interrupt void IRQ_extint1 ( void )
{
status = STOPREQUEST;
EIRR0_ER0 = 0; // clear ext. int 0 request flag
ENIR0_EN0 = 1; // enable ext. int0
EIRR0_ER1 = 0; // clear ext. int 1 request flag
ENIR0_EN1 = 0; // disable ext. int1
}