Can anyone verify that my saving/restoring W and STATUS below are correct?
I'm getting VERY erratic behavior in my foreground code with or without
this snippet (even if I just change the status register in the ISR), and
I'm not entirely sure that it's really saving off the status register
properly. From what I understand, if I'm doing a fast interrupt, I need
to save/restore registers myself:

...saving context...

        movwf   ISRHighW                ; Save off W
        movf    STATUS, W               ; Put status in W
        movwf   ISRHighStatus           ; Store the status

...restoring context...

        movf    ISRHighStatus, W        ; Save off working register
        movwf   STATUS                  ; Put back in status register
        movf    ISRHighW, W             ; Restore W!
        retfie

I have the quintessential guide to the PIC, but it's a 16F in the book
which contains assembly syntax that won't work on the 18F. ;-| I'm hoping
my translation is correct - please advise me if it isn't. Thanks!


-->Neil

-------------------------------------------------------------------------------
Neil Bradley            In the land of the blind, the one eyed man is not
Synthcom Systems, Inc.  king - he's a prisoner.
ICQ #29402898

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics