Paul wrote:
>Hi group,
>
>In the code below, I want to set a bit in the [INDF] => 0x30 register during
>each loop. The label "loop" will be executed
>eight times, each time I wish to do the following, using temp1 as a bit index
>variable.
>
>loop 1:  BSF INDF,7  ;0x30 = 10000000
>loop 2:  BSF INDF,6  ;0x30 = 11000000
>loop 3:  BSF INDF,5  ;0x30 = 11100000
>loop 4:  BSF INDF,4  ;0x30 = 11110000
>loop 5:  BSF INDF,3  ;0x30 = 11111000
>loop 6:  BSF INDF,2  ;0x30 = 11111100
>loop 7:  BSF INDF,1  ;0x30 = 11111110
>loop 8:  BSF INDF,0  ;0x30 = 11111111
>
>
>However, only BSF INDF,7 appears to work during simulation.  So, is it
>possible?
>
>Thanks,
>
>Paul
>
>BEGIN:
>
>
>     MOVLW   0x07
>     MOVWF   TEMP1
>LOOP
>     MOVLW   0x30
>     MOVWF   FSR
>
>     BSF INDF,TEMP1
>     DECFSZ  TEMP1,F
>     GOTO    NEXT_LBL2
>;

Hi Paul,
You can't use a file register as the bit number in the BCF instruction.
One way to do it would be shifting (RRF) in a 1 from the carry position
each time during the loop. Something like this should do:

         movlw           0x08            ;
         movwf           temp1           ;set up loop counter
         movlw           0x30            ;
         movwf           fsr             ;point fsr to ram
         clrf            indf            ;start with result 00000000
loop:
         bsf             indf,7          ;set bit 7 (1xxxxxxx)
                                         ;do something with result here?
         rrf             indf,f          ;rotate it towards lsb
         decfsz          temp1,f         ;last loop?
         goto            loop            ;no

Regards...

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