Setting up WDT

[sjharris]

hello all in ccs forums.

could you help me set up a watch dog timer using the prescalers on a PIC 16F688.

I am not using Timer 0 in my program at all so I should be able to get the time out period to be as high as 30 seconds?

I do not fully understand the prescalers envolved with setting up the WDT so any and all help would be most appreciataed.

I would like to use the Watch Dog Timer to check that my program is running ok every 30 seconds, I think I understand that without the prescaler the reset is approx 0.47 seconds is this correct ?

If so how can I change to time out to be as high as 30 seconds (datasheet says 1ms to 268 s here -->

http://ww1.microchip.com/downloads/en/DeviceDoc/41203C.pdf

Thanks for any help in advance.

S Harris

PS Is this correct:-

setup_timer0(RTCC_INTERNAL|RTCC_DIV_1);
setup_counters(RTCC_INTERNAL, WDT_DIV_65536);

what would this give as a WDT reset?

thanks

[kender]