> From:          Shane Nelson <i@CHEETAH.SPOTS.AB.CA>
> Subject:       clock code challenge:
> Hi,
> After having seen the amazing results from other code challenges
> I thought I would try putting one out there myself.
> The goal is to have a routine that increments and keeps track of
> time in a BCD format.
> Points are scored as follows:
>         1 point for each ROM location used.
>         3 for each RAM.

; BCD clock code challenge
; WARNING: This code is not tested
;
; The regs must be allocated so that a certain bit is set only for
; the hours, for example:

seconds EQU     20
minutes EQU     21
hours   EQU     22
#define hoursFlag               FSR,1

ClockTick:      MOVLW   seconds
loop:           MOVWF   FSR
                        INCF            INDF,f
                        MOVLW   6
                        BTFSC   hoursFlag
                        MOVLW   11
                        ADDWF   INDF,f
                        BTFSS   STATUS,DC
                        SUBWF   INDF,f
                        MOVLW   60
                        BTFSC   hoursFlag
                        MOVLW   24
                        SUBWF   INDF,W
                        BTFSS   STATUS,C
                        RETURN
                        CLRF            INDF
                        INCF            FSR,W
                        BTFSS   hoursFlag
                        GOTO            loop
; This last instruction is not necessary if the code that's executed
; after the routine follows, in that case the "RETURN" of a fwe lines
; above should be a "GOTO..."
                        RETURN

IF it works, it is 19 or 20 ROM words long, and uses 3 regs and FSR.
That is 31 or 32 points.

Regards,




Andres Djordjalian                             mailto:adjordj@aleph.fi.uba.ar

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