Hey Scott,

Doesn't look right :) Your code will add 1 to the counter when it
reaches 3 instead of clearing it.

Here is another idea:

        incf File, w    ;11->100
        andlw 0x04
        skpz
         clrf File      ;11->00

 Nikolai

> Subject: Re: [PIC]: Modulo 3 code
> From: Scott Dattalo (scott@DATTALO.COM)
> Date: Sat Jun 15 2002 - 11:01:41 PDT

> On Sat, 15 Jun 2002, Peter L. Peres wrote:

>> Hi,
>>
>> I need to make a modulo 3 counter in a file. I've come up with this code:
>>
>>   movlw 0x03
>>   andwf File,w  ;
>>
>>   xorlw 0x03    ; 11 -> 00
>>   btfss STATUS,Z
>>   xorlw 0x03    ; undo xorlw above
>>
>>   movwf File
>>
>> I actually need the movwf at the end to be like this because I have to add
>> in some flags. Surely there is a MUCH shorter way to do this ...
>>
>> Peter
>>
>> PS: The code has to be constant run time


>     how 'bout

>     rrf    File,w
>     andwf  File,w
>     andlw  1
>     addwf  File,f

> Scott

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu