NEIL GANDLER <PICLIST@MITVMA.MIT.EDU> wrote:

> I remeber once reading about a quick routine to clear all user
> defined bytes in the 16c74. This would be helpfull when there is a
> reset that is not a POR, yet would like to clear all memory. I would
> appreciate any info.

Try this, Neil:

        MOVLW   020H            ;PREPARE TO ZERO ALL GENERAL-PURPOSE
        MOVWF   FSR             ;REGISTERS.

    CLRRAM:

        MOVLW   080H            ;ARE WE POINTING PAST THE FINAL PAGE-0
        XORWF   FSR,W           ;REGISTER?

        SKPNZ                   ;IF NOT, SKIP AHEAD.

        BSF     FSR,BIT5        ;OTHERWISE, ADJUST FSR TO SKIP OVER
                                ;THE PAGE-1 SPECIAL-PURPOSE REGISTERS.

        CLRF    INDF            ;ZERO THE REGISTER AT WHICH WE'RE
                                ;POINTING.

        INCFSZ  FSR             ;HAVE WE DONE THEM ALL?
        GOTO    CLRRAM          ;IF NOT, LOOP BACK AND ZERO ANOTHER.

-Andy

Andrew Warren - fastfwd@ix.netcom.com
Fast Forward Engineering, Vista, California
http://www.geocities.com/SiliconValley/2499