I can't even make an LED flash!

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  1. - 2nd April 2007, 08:31 #6
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    Quote Originally Posted by George View Post
    I'm playing with a 16F628 and for some reason I'm having significant trouble, I'm running a 4MHz crystal with 15pF caps - am running crystal rather than INTRC as I'm wanting reliable serial comms - but in the interum I can't even flash an LED - can anyone please tell me where I'm going wrong? I know it'll be something stupid but stuffed if I can figure it!

    Thanks

    @ DEVICE PIC16F628, XT_OSC, MCLR_OFF, PROTECT_OFF, BOD_ON, CPD_OFF, WDT_ON

    DEFINE OSC 4

    TRISA = %00000011
    TRISB = %10000000

    T1CON = %00000011
    VRCON = 0 ' A/D Voltage reference disabled
    CMCON = 7 'Disable comparitor
    OPTION_REG = %01010111

    PortA = 0
    PortB = 0

    start:

    portb.2 = 1
    pause 100
    portb.2 = 0
    pause 100
    goto start
    Data sheet says to add @ DEVICE PIC16F628, PWRT_ON whenever BOD is enabled
    Also: I do not believe this chip has A/D converters so VRCON is likely not valid but I am really unsure about that.
    Last edited by Archangel; - 2nd April 2007 at 08:36.
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