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Adding More SERCOM Ports for SAMD Boards - SparkFun Learn

https://learn.sparkfun.com/tutorials/adding-more-sercom-ports-for-samd-boards

“SERCOM (Serial Communication) is a multiplexed serial configuration used on the SAMD21, SAMD51 and other boards. It allows you to select various serial functions for most of your pins. For example, the ATmega328 which has UART (RX/TX) on one pair of pins, I2C (SDA/SCL) on another set, and SPI...” (from the page’s text)

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