Data Sheet

• nRST – Reset pin, connect to ground to reset. Also works using RESET button.
• AREF – Analog Reference pin. Reference voltage is usually the same as chip logic voltage (3.3V) but
alternative analog voltage references can be used by connecting to this pin and selecting external AREF.
Reference voltage cannot exceed 3.3V.
• SWD – SWD programmer and debugger port. Contains SWCLK and SWDIO pins follows the standardized
10-pin FTSH interface with compatibility to most SWD programmers. To use programmer, the Haply M0
may have to be externally powered using either the microUSB port or the power-in port.