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Homework Help: PIC16F877, sample coding regarding the use of switch

  1. Aug 22, 2009 #1
    1. The problem statement, all variables and given/known data

    I'm learning PIC recently. Below is the coding that i have prepared and the attachment is the connection that I used. My question is, why the 2 LEDs will on immediately once i trigger the PIC? This is because the result is not something that should be coming out. What's wrong with my connection or my coding?

    Below is the coding part:
    define osc 8
    TRISA.0 = 1
    TRISA.1 = 1
    TRISD.0 = 0
    TRISD.1 = 0

    L1 var portd.0
    L2 var portd.1
    s1 var porta.0
    s2 var porta.1

    portd = 0
    if s1 = 0 then
    L1 = 1
    L1 = 0
    if s2 = 0 then
    L2 = 1
    L2 = 0
    pause 500
    goto Main
    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

  2. jcsd
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