4.1.2 Alternate Signals Header

The alternate signals header is marked with "Alternate" in silkscreen of the kit. The signals provided here are otherwise hard to do measurements on.

Table 4-3. Alternate Signals Header
Pin on header	Pin on SAM R21	Function
1	PA09	RFCTRL1, negative antenna switch control signal
2	PA12	RFCTRL2, positive antenna switch control signal
3	PA27	GPIO, chip select on the EDBG DGI SPI bus

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