Is the WDT enabled??

Glenn Davidson wrote:
>
> Hello,
>    I am working on a Digital Calendar based around a PIC16F877
>    operating at 20MHz, for part of my degree project.  My deadline is
>    only a few weeks away, and I have been coming up against what seems
>    to be an infinite loop for the past few weeks.
>    I have written smaller test programs to try and ascertain the cause
>    of the problem, but so far with no luck.
>    Yet if I step through the code using MPLAB 5.11's simulator, it
>    appears to return from the particular sub-routine correctly.
>    The point in the code where it appears to simply stop is in the RTC_DELAY
>    sub-routine.
> RTC_DELAY
>         MOVLW   D'254'
>         MOVWF   DELAY_COUNT     ;set counter value
> RTC_DELAY_LOOP
>         DECFSZ  DELAY_COUNT,F   ;dec delay_count, is zero? if yes, skip next
>         GOTO    RTC_DELAY_LOOP  ;no, else loop
>         RETURN                  ;yes, return
>
>    It's a very simple routine, and I can't see how it is failing,
>    though I am currently worried about completing on time, at all.
>
>    I am using an ICEBreaker In-Circuit Emulator from Magenta
>    Electronics (with the ICEBreaker programming and monitoring
>    software), with a PIC16F877, interfacing with a DS1302 Real-Time
>    Clock.  Using MPLAB 5.11 for development/simulation/assembling.
>    I can include the test programs and full program source if
>    necessary.
>    Any help would be greatly appreciated.  For this part, I am simply
>    trying to write-to and read-from the Real-Time Clock chip.
> --
> All the best,
>  Glenn Davidson
>
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