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Pic16f628a multiple interrupt issue
Hi,
I have two interrupts enabled in my program, one is a timer interrupt and the other is an interrupt-on-change. I have noticed that if an interrupt occurs during the service of the other interrupt (ie the timer occurring during IOC) the first interrupts(IOC) flag doesn’t get cleared. This results in the original interrupt being serviced twice:
1) The first interrupt is serviced but the interrupt flag not clearing
2) The second interrupt is serviced (and flag cleared)
3) The first interrupt is serviced again because the flag didn’t clear the first time (flag is cleared this time)
Can someone please help me with this issue.
Many Thanks.
The following is my code:
#include <htc.h>
#include <pic.h>
#include <pic16f62xa.h>
unsigned int counter = 0;
unsigned char result;
void interrupt Timer0_ISR(void)
{
if (T0IF) // timer interrupt flag set
{
counter++;
if (counter >= 50)
{
counter = 0;
}
TMR0 = 200;
T0IF=0; //Interrupt not cleared if IOC
}
if (RBIF) //IOC flag
{
result = PORTB;
RA0 =~ RA0;
RBIF=0; //Interrupt not cleared if TMR0 overflows
}
}
Init(void)
{
CMCON=0×07;
TRISB = 0xff;
TRISA = 0×00;
TMR0 = 200;
OPTION = 0×88;
INTCON = 0xa8;
// T0IE = 1;//enable TMR0 overflow interrupts
// GIE = 1; //enable Global interrupts
}
void main()
{
Init(); //Initialize the relevant registers
while(1) //Loop forever
{
}
}
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