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Software for Signboard 2
[Edge LED flash Clockwise]

This routine sholud be put on the main process. Function This routine makes the turn of the edge LED clockwise. Source code
    001
    002
    003
    004
    005
    006
    ;*************  Edge LED flash to Right  ****************
    right
            movf    portb,w         ;Read portb
            iorlw   h'80'           ;Set right 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 OR instruction to change only RB7.