Barnaby wrote:
>Hello List
>
>I'm taking an existing circuit board from the 16C67 to the 16F877.
>Everything seems to work normally except for a bit-banging routine which
>manually controls an RS-232 driver (the USART is tied up elsewhere).  For
>some reason, the 232 communication fails frequently on the 877 but not on
>the 67.  To make matters more confusing, this problem only occurs with
>burned chips, and does not occur on the MPLAB ICE.  The 232 handling is NOT
>going through the USART -- it is being handled directly by code.
.............>


Are you using RB0/external interrupt for your RS232 RxD
line, or just polling to sense receipt?

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