Hi

EXT_INT cannot detect the character, only the low going edge of the start
bit.

You must then disable EX_INT and set up a timer to sample start bit again
1/2 bit period later, then sample 8 bits 1 period later then the stop bit.

If the character is valid, store it and re-enable the EXT_INT for next char.

The receive routine that shifts the received bits into your byte variable
for RX_CHAR
would work well in assembly code (#asm..... #endasm)

Regards

David Huisman

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