On January 5, 2006 05:00 pm, Sean Schouten wrote:
> Hi guys,
>
> What seems to be no more than perhaps a simple logical operation
> seems to defy my logic.
>
> Using the following code in a small loop, I don't seem to be getting
> the desired-output when monitoring the W-Register:
>
> [code]
>
> START
>
>         MOVLW       0xFF
>         MOVWF      TEMP_VAR	;where is TEMP_VAR located?
	clrc		;clear the carry bit (bcf status,c)

> MAIN
>
>  ;not needed unless you want to waste time  NOP
>         MOVF         TEMP_VAR, W	;just watching, not needed
>         RRF            TEMP_VAR, F	;no guessed destination
>
>         GOTO         MAIN
>
> [/code]
>
>
> What I want to happen is this:
>
> 11111111
> 01111111
> 10111111
> 11011111
> 11101111
> 11110111
>
> etc....
>
>
> What happens is more like:
>
> 11111111
> 01111111	;okay so far...
> 10000000	;if "stepping" find this hard to believe
> 11000000
> 11000001
> 11100001
> 11100010
>
>
> Does anybody have any idea what could be going wrong, because I am
> really lost.

Where is your TEMP_VAR located?
It should not be a special location like a port or anything hardware 
related, but simply a plain register.

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