I was getting really weird behavior from a PIC16F648A:

The serial data out was available at both RX (RB1) and TX (RB2) pins.
At first I suspected that both pins could be shorted together outside of
the chip, then I noticed that the RX pin signal was inverted.
Very odd, because I don't have any inverter on the board, not even a
transistor.

After too much fuss (even cutting tracks and removing components), I
found that I had the RX and TX pin directions reverted (TRISB register).
Then I corrected the pin directions and everything worked OK. It is
worthy noticing that bit CREN at RCSTA was turned off also.


I will restore the wrong code to confirm it all, but it is a very odd
behavior indeed, RX outputting the inverted signal when configured as
output.


Isaac

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