Secure Pin Multiplexing on SERCOM

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

This feature is automatically enabled as soon as the security attribution of the SERCOM is set to Secured using the PAC peripheral.

When this operation occurs:

• The secured SERCOM instances become mapped only on a specific set of I/Os
• All of the alternate I/O pins of the secured SERCOM instance are kept in a Hi-Z configuration
• The PTC cannot enable PTC lines mapped to any of the secured SERCOM instance I/O pins
• The CCL I/Os mapped to the secured SERCOM instance I/O pins are set to '0'

Refer to Table 1 to obtain the list of pins supporting that feature.