I'm using the 16f628's built-in uart (fwiw: 4MHz clock, asynchronous 31.25k
baud, 8 bit).
For output, I wait for TXSTA<TRMT> before writing to TXREG. Meanwhile,
incoming serial data is handled by interrupt. This mostly works, but every
once in a while (actually quite often) TXSTA<TRMT> gets stuck on 0 and never
goes to 1(!). Have you ever heard of this problem? Any suggestions welcomed.
It *seems* to occur when serial input and output are happening concurrently,
but that's just my impression. Hope someone can help me out.


--m

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