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Software for Signboard 2
[Edge LED flash Counterclockwise]

This routine sholud be put on the main process. Function This routine makes the turn of the edge LED counterclockwise. Source code
    001
    002
    003
    004
    005
    006
    ;*************  Edge LED flash to Left  *****************
    left
            movf    portb,w         ;Read portb
            andlw   h'7f'           ;Set left data
            movwf   portb           ;Output data
            return
Explanation In this processing, it reads the condition of present PORTB and it sets only RB7 to '1'. It uses an AND instruction to change only RB7.