Hi,
I have never liked the 16F877A pic. When I used it I always had resets and other strange issues so I just changed to 18F452 or 18F4620 which are both pin-compatible with the 877A and not that much more expensive.
Just make sure the LVP (low voltage programming) is turned off in the config bits.
Sometimes I rather have a working product than really understanding why it doesnt work.
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