ItsyBitsy M0/M4 Wiring

The ItsyBitsy has pins SWDIO and SWCLK broken out on the back edge of the board. You'll need a SWD cable breakout to connect the J-Link to an ItsyBitsy:

SWD (2x5 1.27mm) Cable Breakout Board

This adapter board is designed to make it easier to use ARM dev boards that use slimmer 2x5 (0.05"/1.27mm pitch) SWD cables for programming.  It's helpful for using...

ItsyBitsy Wiring

Make the following connections between the ItsyBitsy M0/M4 and the SWD Cable Breakout:

  • ItsyBitsy GND to Breakout GND
  • ItsyBitsy 3V to Breakout VRef
  • ItsyBitsy SWCLK to Breakout CLK
  • ItsyBitsy SWDIO to Breakout SWIO
You must also plug in a USB cable to the ItsyBitsy to power it during progamming
This guide was first published on Jan 25, 2019. It was last updated on Jan 25, 2019. This page (ItsyBitsy M0/M4 Wiring) was last updated on Jan 27, 2020.