60.6.3.3 PIO Backup Controller

The SECUMOD includes a PIO Controller powered by VBAT which handles the 4 PIOBU I/O pins.

Each I/O line is controlled by the PIO Controller and each pin can be configured to be driven. This is done by writing in the corresponding SECUMOD PIO Backup register (SECUMOD_PIOBUx). When SECUMOD_PIOBUx.OUTPUT is at ‘0’, the corresponding I/O line is used as an input only. When this bit is at ‘1’, the corresponding I/O line is driven by the PIO Backup Controller.