16F54 fickle!

Posted on Feb 6, 2014

The most they do is seemingly run the code, but with a few I/Os unfunctional. e.g. half the LEDs it drives work, aseemingly random half. I have tried the Microchip suggested slow power-up circuit without success. Seems like it shouldn`t need it, because the exact same circuit didn`t need it before, and still doesn`t need it when running with 16F84As. For now I have switched to 16F628As as a short term substitute just to have a

16F54 fickle!
Click here to download the full size of the above Circuit.

working model. Those things with their built in brown out reset, power on timers, resets correctly every time in the same circuits. Here`s the schematic without the slow power-on circuit I tried, as it didn`t seem to help any. It shows an OTP part, because the software didn`t have the flash part listed.

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