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Unleashing the power of flexible I/O pin mapping

Posted: 16 Nov 2007     Print Version  Bookmark and Share

Keywords:I/O pin mapping  MCU 

Feature creep and a tendency to maximize functionality within a compact microcontroller (MCU) often create problems for embedded system designers. Did you ever run into a situation where the application demanded multiple universal asynchronous receiver transmitters (UARTs), more than one serial peripheral interface (SPI) channel, and a few I/O pins? You zeroed in on a low pin-count MCU with the feature set you were looking for, only to later realize that everything about this design looked great until you started working on the schematic. Then you found out that one of the UART's pins was multiplexed (two functions on same pin) with another peripheral you were trying to use in the application.

If you've ever encountered this situation, you're not alone. The use of multiple serial channels is just one example. You'll find many design examples where two hardware peripheral features you need are actually mutually exclusive features, due to I/O pin multiplexing on the MCU.

View the PDF document to find out how you can flexibly map I/O MCU pins.

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