Is this shifting your code so that you have a PCLATH problem?

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

----- Original Message -----
From: "Nick Veys" <nick@VEYS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, June 20, 2001 11:04 PM
Subject: [PIC]: 16F870 Error defying logic...


> Absolutely mind boggling.  I have a chunk of code causing some kind of
> software reset.  The WDT is disabled, in fact, all interrupts are disabled
> in this program in it's entirety.  The kicker is, this code is NOT being
> executed when the reset occurs, it is tied to one button, the other button
I
> push works fine but randomly causes a reset...  when I comment out the
code,
> it works fine (of course it doesn't do what I need though.)
>
> Here's the snippet...  It's an EEPROM data write.
>
>   ; ** EEPROM DATA STORAGE
>   BANK0
>   movf DEVSTATUS,w                              ; load data
>   bcf PIR2,EEIF                                 ; clear complete flag just
in case
>   BANK2                                         ; go to bank2
>   movwf EEDATA                                  ; set DATA
>   movlw 0                                               ; load address
>   movwf EEADR                                   ; set ADDRESS
>   BANK3                                         ; go to bank3
>   bcf EECON1,EEPGD                              ; DATA memory
>   bsf EECON1,WREN                                       ; enable writes
> ;  movlw 0x55                                   ; * required
> ;  movwf EECON2                                 ; * eeprom
> ;  movlw 0xAA                                   ; * writing
> ;  movwf EECON2                                 ; * crap
>   bsf EECON1,WR                                 ; initiate write
> ;  bcf EECON1,WREN                              ; disable writes
>   BANK0
> ;  btfss PIR2,EEIF                              ; wait til the
> ;    goto $-1                                   ; writing is complete
>   bcf PIR2,EEIF                                 ; clear complete flag
>   return
>
> if I uncomment any of those lines in ANY combination, I get a reset after
a
> few presses on my button, which DOES NOT execute this code :( :( :(   It's
> almost as thought just having this code in makes it act erratic.  This is
> reproducable on 2 different chips, I'm out of ideas and frustrated...
>
> nick@veys.com | www.veys.com/nick
>
> --
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>
>

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