Michael,

 Bingo!!!  I checked and sure enough PrintHex uses a register in bank0.
 And since we were in bank1, it lost it's mind.  We changed the PrintHex
 routine to always return to bank0, and now it works like we wanted it to
 and not like we told it to.   Thanks Michael for the pointer to the right
 direction.   And thanks to all who responded.

 I hope the PICLIST goes on forever.  What a think tank.

                                         Regards,

                                           Jim

 P.S.   Michael, aren't you located somewhere around Spring or Conroe
        or something?   I'm in Stafford.



> It seems odd to me that you'd switch to Bank1 and then call a
>subroutine.  Does the PrintHex routine assume that it's pointing to
>Bank1 upon entry?  What about RP1, is it always 0?
>
> michael brown
>
>
>
>> All,
>>
>>  A question about the 10 bit AD on an F877.  Referring to the code
>snippet
>>  below, looking at the line indicated ( by **--->), can anyone explain
> why
>>  when this reads 'bsf   STATUS,RP0', the program hangs apparently at
> that
>>  line.   If we change it to read 'bcf   STATUS,RP0', the program don't
> hang,
>>  but we still can't get the 2 bits of the LSB.   We've tried adding a
> wait
>>  before changing banks, we've tried changing the justification of the
>>  result, we've tried changing the order in which we read the result,
> we've
>>  cussed at it, etc., etc., but nothing has helped.   I tried calling
> MCHIP,
>>  but the phone message says they can't answer the phone at this time,
>so I
>>  just left a message.  But I need an answer ASAP.  I prefer not to
> wait
>>  until next week when they get back to me, if then.  If you have any
>>  further questions, email me.
>>
>>  Does anyone have any ideas to try that I haven't mentioned?   If so,
> any
>>  and all are welcome.   Please advise.
>>
>>
>>                                                 Thanks and Regards,
>>
>>                                                        jim
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> RdVrp   ; read ASIC pos ref voltage
>>         errorlevel      -302
>>         bcf     STATUS, RP0                   ;bank 0
>>         bcf STATUS, RP1
>>         movlw   B'01001001'                   ;Fosc/8, A/D chan 1, A/D
> on
>>         movwf   ADCON0
>>         bsf     ADCON0, GO
>>
>>         movlw   D'1'
>>         call Wait
>>
>>
>> VrpWait
>>         btfsc   ADCON0, GO
>>         goto    VrpWait
>>
>>         bcf     STATUS, RP0
>>         movf    ADRESH, W
>>         movwf   AccaH
>>
>> ;       movlw   D'2'                            ; wait 2ms
>> ;       call    Wait
>> ;       bcf     PIR1, 6                         ; clear int flag
>>
>>
>>
>>  **---> bsf     STATUS,RP0                      ; goto page 1
>>
>>
>>
>> ;       movf    ADRESL, W
>> ;       movwf   AccaL
>>         call    PrintHex
>>         return
>>
>> --
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