Don French wrote:

 > ...but why do both GIE and PEIE need to be set
 > for the unplanned interrupt to occur?

On the RX-pin specificaly ?
Maybe becuse that's how it's documented ?

GIE: Glabal enable (must always be set).
PEIE: Peripherial enable, and the USART is an peripherial.

Or did I missunderstand the question ?

Jan-Erik.

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