--- Jim Tellier <jimtellier@COX.NET> wrote: > >Bob Ammerman wrote:
>
> > What is the state of the IRP bit in STATUS?
>
i tend to include macro files to take care of page/bank selects ... makes it
easier to "see where u are" in the code.
Debbie :)
;**********************************************************************
;MACRO SECTION (I) ... 'bank select' MACROS
;
;STATUS for 'bank select' in STATUS REGISTER
;
;   b6     b5
;   0      0      BANK #0
;   0      1      BANK #1
;   1      0      BANK #2
;   1      1      BANK #3
;**********************************************************************
BANK_0 MACRO
 bcf   STATUS,RP0
 bcf   STATUS,RP1
 ENDM

BANK_1 MACRO
 bsf   STATUS,RP0
 bcf   STATUS,RP1
 ENDM

BANK_2 MACRO
 bcf   STATUS,RP0
 bsf   STATUS,RP1
 ENDM

BANK_3 MACRO
 bsf   STATUS,RP0
 bsf   STATUS,RP1
 ENDM

;******************************************************
;MACRO SECTION (II) ... 'page select' MACROS
;
;STATUS for 'page select' in PCLATH
;
;   b4     b3
;   0      0      page #0
;   0      1      page #1
;   1      0      page #2
;   1      1      page #3
;******************************************************
PAGE_0 MACRO
 bcf   PCLATH,4
 bcf   PCLATH,3
 ENDM

PAGE_1 MACRO
 bcf   PCLATH,4
 bsf   PCLATH,3
 ENDM

PAGE_2 MACRO
 bsf   PCLATH,4
 bcf   PCLATH,3
 ENDM

PAGE_3 MACRO
 bsf   PCLATH,4
 bsf   PCLATH,3
 ENDM


> Upon startup, I always do:
>     bcf    STATUS, RP0
>     bcf    STATUS, RP1
> I've not touched the IRP bit directly, but I believe it's supposed to
> power-up as '0'.
>
> and
> >Nigel Orr wrote
>
> >> ...
> > >     incf        INDF  ; Increment the value at register ((contents of
> > > location 0xA0)+0xA0)
> ...
> > > Where is B1_COUNT initialised?
>

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