Scott Pierce wrote:

Don't forget PORTA works even though you are not using it. The inputs
will float if left as unconnected inputs, so set them as outputs to keep
the chip happy.

> start   movlw   0x00
          tris    porta   ;<<<<< ADDED
>         tris    portb   ;set portb to all outputs
>         movlw   0xff    ;set portb high
>         movwf   portb   ;set portb to all 0's
>         clrf    counti  ;set counti to 0
>         clrf    countj  ;set countj to 0
>         clrf    count   ;set count  to 0
> ;
> ;==============================================================================
> ;
> dispcnt movf    count,w ;move contents of count into work register
>         movwf   portb   ;output contents of count to portb
>         call    pause
>         incf    count,f ;increment count by one, results stored in file reg
>         goto    dispcnt ;start loop over again
> ;
> ;==============================================================================
> ;

The counter values were not as you say in your comments. You also had
the delay kept in a permanent loop. The code changes appear below.


> pause   movlw   0x0f    ;set counter to 254

         movlw 0xFE      ;set counter to 254

>         movwf   counti  ;move work register to counti file register
> loadj   movlw   0x0f    ;set countj to 255
         movlw 0xFF      ;set countj to 255

>         movwf   countj  ;move work register to countj file register
> decj    decfsz  countj,f;decrement countj, if zero skip next instruction
>         goto    decj    ;loop decj again until countj = 0
>         decfsz  counti,f;decrement counti, if zero skip next instruction

         goto    decj   ;loop loadj again until counti = 0
>         goto    loadj   ;loop loadj again until counti = 0
>         return          ;when nested loops are done, return to dispcnt loop


--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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