Adding More SERCOM Ports for SAMD Boards

Contributors: M-Short

Helpful Charts

I promised you some charts.

• Let's start with the SAM21 datasheet. Starting on page 21 under I/O Multiplexing and Considerations, you'll see all the pin definition including the mux options. This is really where everything comes from.
• Next are the graphical datasheets. While these are available on the product pages of any board that has one, here they are as a neat little collection.

Now here are a few charts I made to help you out...

Arduino Pins on SAMD21

Note: The ISP header does not name the pins individually so it is referred to as ISP or the actual SPI pin names that are used on the board.

Note: A comma means there are 2 pins that can use that port. A slash denotes 2 different names for the same pin.

Note: Some pins are tied directly to the USB port or the Crystal and not available for use. They are labeled as such.

Arduino Boards

I also figured it might be nice to know which SERCOM ports are open on different Arduino boards. Below is a table that lists what SERCOM ports that are already assigned to a serial protocol for a few development boards.