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PIC Microcontoller Delay Method

Delay X cycles (20-271) inclusive

From Andrew Warren

    ; This routine delays X cycles.  Enter with X (in the range
    ; [20-271]) in the W register.
    ;
    ; Note that the delay is inclusive of the "MOVLW X", "CALL
    ; DELAY", and "RETURN" overhead, so a sequence like:
    ;
    ;     MOVLW   100
    ;     CALL    DELAY
    ;     MOVLW   200
    ;     CALL    DELAY
    ;
    ; will delay EXACTLY 300 cycles.

    DELAY:

        MOVWF   COUNTER

        BTFSC   COUNTER, 0
        GOTO    $+1

        BTFSS   COUNTER, 1
        GOTO    SKIP
        NOP
        GOTO    $+1

    SKIP:

        RRF     COUNTER
        RRF     COUNTER

        MOVLW   4
        SUBWF   COUNTER

        BCF     COUNTER,6
        BCF     COUNTER,7

    LOOP:

        NOP
        DECFSZ  COUNTER
        GOTO    LOOP

        RETURN

See also:


file: /Techref/microchip/delay/8b1cr20m-aw.htm, 1KB, , updated: 2003/10/15 10:57, local time: 2018/8/16 05:16,
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