Hi Tony.

> Can anyone improve on this? It would be better not to have a Temp
> register used.
>
> ;
> ; if TimerH:TimerL < 0xAA55 goto EndTime
> ;
>         movlw 0xAA
>         movwf MathTemp
>         movlw 0x55
>         subwf TimerL,W
>         movf MathTemp,W
>         btfss STATUS,C
>         incfsz MathTemp,W
>         subwf TimerH,W
>         btfss STATUS,C
>         goto EndTime

If I understood everything correctly...


        movlw   0xAA            ;high?
        subwf   TimerH,W
        skpc
        goto    EndTime         ;5 cycles

        movlw   0x55            ;low?
        subwf   TimerL,W
        skpc
        goto    EndTime         ;5 or 9 clocks to go
                                ;8 clocks to pass
or

        movlw   0xAA            ;high?
        subwf   TimerH,W
        movlw   0x55            ;low?
        skpnc
        subwf   TimerL,W
        skpc
        goto    EndTime         ;8 clocks to go
                                ;7 clocks to pass

WBR Dmitry.

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