Timer2 causing Resets

[ceegb2]

Hi,

I've got a problem with timer 2 on PIC18F8720, 20Mhz Clk.
I only use it for PWM outputs.

I set it up as:
setup_timer_2(T2_DIV_BY_1,0x65,1);

and when it gets called on an interrrupt :

#INT_TIMER2
void time_increment(void)
{
//do nothing
}


So nothing should happen when it gets called, just use dfor PWM o/p.
However, randomly when I get data in on the USART it causes the PIC to Reset. It is completly random, may be after the 2nd command comes in or after the 200th. All I know is when I comment out all code to do with timer 2 the PIC is fine.

I'm currently on CCSV3.129.

Any ideas or anyone had a similiar problem?

Thanks

Graham Bremner


CS V3.129

[Ttelmah]

[SherpaDoug]

Could your serial interrupt (assuming you are using a hardware UART) be interfering with your PWM interrupts causing you duty cycle to stay ON too long and causing power supply problems, leading to a RESET?
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[drh]

If you are using timer2 ONLY with the PWM module, you don't need to enable the timer 2 interrupt or service that interrupt.