/*******************************************************************
** Project     : inverter example
*******************************************************************/

#include <hidef.h> /* for EnableInterrupts macro */
#include <MC9S08QG8.h> /* include peripheral declarations */

void main(void)
{

ACMPSC_ACMOD = 11; // 1 = comparator output on rising or fallingedge
ACMPSC_ACOPE = 1;   // 1 = comparator output enabled on external pin
SOPT1_BKGDPE = 0;   // 0 = disable bgdb mode on compo pin
ACMPSC_ACIE = 1;    // 1 = comparator interrupt enabled
ACMPSC_ACBGS = 1;   // 1 = use internal reference on ACMP+
SPMSC1_BGBE = 1;    // 1 = enable bandgap buffer for internal reference
ACMPSC_ACME = 1;    // 1 = comparator enabled

ACMPSC_ACF = 1;     // writing 1 clears event flag

// set up output port for an indicator
PTBDD_PTBDD7 = 1;   //set PTB.7 as an output, LED2 on demo board
PTBD_PTBD7 = 1;
PTBDD_PTBDD6 = 1;   //set PTB.6 as an output, LED1 on demo board
PTBD_PTBD6 = 1;

EnableInterrupts;   // inverter can work without generating an interrupt

for(;;)
{
    __RESET_WATCHDOG(); /* feeds the dog */
}// loop

}// end main

//ACMP ISR
interrupt 20 void   ACMP_ISR(void)
{
if (ACMPSC_ACO)
    {
    PTBD_PTBD7 = 1;   // toggle PTB.7 pin on compare event
    PTBD_PTBD6 = 0;   // toggle PTB.6 pin on compare event
    }
else
    {
    PTBD_PTBD7 = 0;   // toggle PTB.7 pin on compare event
    PTBD_PTBD6 = 1;   // toggle PTB.6 pin on compare event
    }

ACMPSC_ACF = 1;             // writing 1 clears event flag
}