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Atmel SAM R21 Xplained Pro [USER GUIDE]
42243A-MCU-02/2014
9
Pin number PWR header
Pin name
Description
4
VCC_P3V3
Regulated 3.3V (output, used as
main power for the kit)
Note
If the board is powered from a battery source it is recommended to use the PWR header. If there
is a power source connected to EDBG USB, the EDBG is activated and it will consume more
power.