>                 ORG     0x004                   ; interrupt vector >
>           movwf   w_temp                  ; save off current W
>                 movf    STATUS,w                ; move status register >
>               bcf     STATUS,RP0              ; ensure file register >
>             movwf   status_temp             ; save off contents of
>                 movf    DelayValue,w            ; move status register >
>               movwf   DelayTemp               ; save off current

This is not a valid method of context saving.  That is because 'movf'
affects the STATUS register.  The example below performs proper context
saving/restoring.  'swapf' does not affect the STATUS register.

To save:
                movwf   w_temp          ; save off W and STATUS registers
                swapf   STATUS, 0
                movwf   status_temp
                clrf    STATUS          ; select Bank0

To restore:
                swapf   status_temp, 0          ; restore all registers
                movwf   STATUS
                swapf   w_temp, 1
                swapf   w_temp, 0
                retfie                          ; return from interrupt

I really didn't look at the rest very carefully; there may still be errors
hiding there as well.  Try the abovementioned fix first.

You're using a chainsaw to cut butter in your program, but it's good to
explore all the options of the PIC first before you actually try a more
complex program.  I'm assuming, of course, that you intend to do something
more complicated with this chip, otherwise you could use an 8-pin or 18-pin
flash chip without the extra timers, ports, options, etc.

--Andrew
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