Jose L. wrote:
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Can I use the serial port of my microcontroller (80c32)for two differents functions? I mean, for communications with a PC and for connecting to a magnetic card reader.


Use an analog multiplexer, say CD405x from Natsemi. Inputs to 8052 RX/TX; a couple of outputs to MAX232; another couple to the mag card reader (these usually work with plain CMOS logic levels, check yours). And a control line for the analog mux. Done.

Txip.