Blinky on Lab-X1 twice as fast on 16F877 as on a 18F4550

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  1. - 5th May 2023, 07:02 #5
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    Ioannis
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    Default Re: Blinky on Lab-X1 twice as fast on 16F877 as on a 18F4550

    Do you have any means to check the real frequency oscillator output that is going to the PIC?

    Also, JP3 does no look that is is correctly connected. PIC should be on the midle pin and the jumper select either 4MHz or the CLK output of the chip U2.

    If Y1A out pin is the PIC clock input, then this pin will always get 4MHz as the diagram shows no matter what the other jumpers are at.

    Correct me if I am wrong, but on that diagram seems to me that way.

    Ioannis
    Last edited by Ioannis; - 5th May 2023 at 07:10.
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