I am not very good with PHP but you may want to slow the PIC to PHP baud down to 2400 to test things.
What type of oscillator are you using?
A line feed and carriage return might help at the PHP receive end (10, 13) at the end of every transmission.
Have you tried a complete chip erase? what programmer and software?One more question, unrelated to the above: Somehow I got all zereos on a 16f628 and it appears useless. I am using a pic programmer. Is there any recovery procedure available? What causes this?
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