Timer 1 kills PIC

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  1. - 11th January 2009, 23:22 #2
    Darrel Taylor's Avatar
    Darrel Taylor
    Darrel Taylor is offline Fanatical Contributor
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    I doubt that it's related to Timer1.
    I use Timer1 all the time and have never had a similar problem.

    I would suspect LVP (Low Voltage Programming) RB4.

    What do you have attached to RB4?
    It should be connected to something that provides a LOW voltage on power-up.

    When the chip is erased, LVP is automatically enabled.
    If the pin is left floating or has a HIGH level on the pin, the chip will not program anymore.

    Placing a resistor from RB4 to ground will solve the problem...
    If that is the problem.
    Added: Are you using an external crystal for Timer1?
    T1CON = %00001010 enables Timer1's External oscillator, and those pins are also the clk and data pins for ICSP.
    The programmer may have problems if there's a crystal attached.
    <br>
    Last edited by Darrel Taylor; - 12th January 2009 at 00:25. Reason: Added:
    DT
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