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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