34.6.3.2 Secure Pin Multiplexing (on SERCOM) Pins (SAM L11 Only)

The Secure Pin Multiplexing feature can be used on dedicated SERCOM I/O pins to isolate a secure communication with external devices from the non-secure application.

Secure Pin Multiplexing is automatically enabled as soon as SERCOM1 is configured as a secure peripheral (PAC Security attribution).

The following table lists the SERCOM pins that support the Secure Pin Multiplexing feature:

Table 34-5. Secure Pin Multiplexing on SERCOM Pins (SAM L11 Only)
Pin Name	Secure Pin Multiplexing Pad Name
PA16	SERCOM1/PAD[0]
PA17	SERCOM1/PAD[1]
PA18	SERCOM1/PAD[2]
PA19	SERCOM1/PAD[3]

CAUTION: When Secure Pin Multiplexing is enabled, only the SERCOM1 pins from the above table become mapped. All of the alternate SERCOM1 pins are kept in a Hi-Z configuration and cannot be selected.