DT interrupts and Pause

[Darrel Taylor]

By the time it finishes the PAUSE 1000, the USART buffer has probably overflowed.

Check the OERR bit (RCSTA.1).
If it's set, you have to toggle the CREN bit (RCSTA.4) to reset the USART.

Since you are using HSERIN, you can set ....
DEFINE HSER_CLROERR 1
But that way, your program will never know when the overflows happen.

Or, you could just wait to set-up/enable the USART until after the PAUSE.
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[Luckyborg]

So once the interrupt is setup, is the USART running in the background even when not enabled and that would cause the overflow? I assumed if I disabled the interrupt the USART was basically sitting there inactive. I would have expected the problem to show up when the interrupt was enabled and there was a long pause, but that seems to execute just fine. I'll play with clearing CREN shortly

[Luckyborg]

Both solutions worked, it is good to know that everything is running in the background and that the problem is that I'm just not servicing the interrupt to keep the flags clear. I'll have to keep that in mind for next time.

Thanks, David