Bob,

I think you're confusing BANKSEL with PAGESEL.  BANKSEL refers to
RAM bank selection and has nothing to do with PCLATH.

Dave D.

You wrote...

>Answers below:
>
>At 12:50 AM 10/26/2003, you wrote:
>>;*****************************************
>>  IFNDEF _DLYMACRO_INC
>>#DEFINE _DLYMACRO_INC
>>
>>         INCLUDE "p16f628a.inc"
>>
>>DLY_10ms                macro
>>
>>; Delay = 0.01 seconds
>>; Clock frequency = 4 MHz
>>
>>; Actual delay = 0.01 seconds = 10000 cycles
>>; Error = 0 %
>>
>>
>>FIXED_REGISTERS UDATA
>>  local d1, d2
>>d1      res     1
>>d2      res     1
>>
>>         CODE
>>Delay_10ms
>>                         ;9993 cycles
>>         movlw   0xCE
>>         BANKSEL d1
>>         movwf   d1
>>         movlw   0x08
>>         movwf   d2
>>
>>Delay_0
>>         decfsz  d1, f
>>         goto    $+2
>>         decfsz  d2, f
>>         goto    Delay_0
>>
>>                         ;3 cycles
>>         goto    $+1
>>         nop
>>
>>                         ;4 cycles (including call)
>>         BANKSEL 0
>>         return
>>
>>         endm
>>
>>  ENDIF
>>;*********************************
>>
>>it assembles with MPASM and it isn't any different than the psuedo code i
>>put in my
>>original post.
>>
>>1) is BANKSEL 0 as opposed to BANKSEL varname_in_bank0 acceptable?
>
>Yes. MPASM assumes '0' to be in the default radix and will generate  the
>proper code. It will generate
>
>movlw   0
>movwf   PCLATH
>
>
>
>>2) what code does the psuedo-mnemonic "BANKSEL var" generate?
>>         a) bcf STATUS, RP0  ??
>>
>>                 -or-
>>
>>         b) movf FSR, bank2var
>>             movwf INDF
>
>No. It has nothing to do with FSR, only PCLATH. It generates:
>
>       movlw     bank2var
>       movwf     PCLATH
>
>
>HOWEVER, If you are using any MPLAB before 5.4, MPASM sometimes makes an
>error in its generation of BANKSEL. I therefore long ago replaced BANKSEL
>with my own MACRO, which never made an error after the change.
>
>Finally, since BANKSEL is actually a 2-line macro substitution, your code
>will NOT work properly if you use any skip instructions with it, such as:
>
>BANKSEL bank1var
>btfsc   STATUS,C
>BANKSEL bank2var
>etc
>etc
>
>--Bob
>
>
>--------------
>Bob Axtell
>PIC Hardware & Firmware Dev
>Tucson, AZ
>1-520-219-2363
>"I lose some on each sale but make it up in volume."

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