Scott,

You have one too many "l's" in "will".

Jim

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Scott Dattalo
Sent: Saturday, March 27, 2010 8:16 PM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] Of course you don't understand this routine.

> SECONDS EQU [any register, on any page]
> MINUTES EQU SECONDS+1
> HOURS   EQU MINUTES+1
>
> TICK: MOVLW SECONDS       ;First, initialize the FSR to point
>       MOVWF FSR           ;  at SECONDS.
>       CALL  SUB1          ;Use the BCD-increment code to inc
>       CALL  SUB0          ;  SECONDS and then MINUTES.
>       CALL  SUB0          ;Call it one last time to increment
>                           ;  HOURS.
>       GOTO  SUB2          ;Keep HOURS in the range [0-23].
>
> SUB0: INCF  FSR           ;You enter here to point to the next
>       SKPNC               ;  register before incrementing it.
> SUB1: INCF  INDF          ;Or enter here to just increment the
>                           ;  register.
>       MOVLW 6             ;Use this MOVLW/ADDWF to see whether
>       ADDWF INDF          ;  reg is outside the range [0-9].
>
>       SKPDC               ;Obscure DC flag usage was contributed
>       SUBWF INDF          ;  by Scott Dattalo.
>       MOVLW 0100H - 060H  ;Load W with a value that'll make the
> SUB2: ADDWF INDF,W        ;  ADDWF overflow if the reg > 60.
>       SKPNC               ;If there's an overflow, clear the
>       CLRF  INDF          ;  register.
>       RETLW 0100H - 024H  ;Now return with W holding a value that
>                           ;  will make ADDWF overflow if reg>24.

Andrew,

I I c m c t e t   r S
t w o y a e t o   e c
h i m v l r h o   g o
i l m e c s i     a t
n l e r o l s     r t
k l n t u i       d
    t i n k       s


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