33.5.15.1.2 Interrupt Freeze

Setting PIO_IOFRx.FINT freezes the following fields of the Non-Secure I/O lines defined in PIO_MSKRx:

• IFEN: Input Filter Enable
• IFSCEN: Input Filter Slow Clock Enable
• EVTSEL: Event Selection

For Secure I/O lines, use S_PIO_IOFRx.FINT and S_PIO_MSKRx to freeze the fields above.

When Interrupt Freeze is currently active on an I/O line, the ICFS flag is set when reading the PIO_CFGRx of the I/O line (or the S_PIO_CFGRx if the I/O line is Secure).

Only a hardware reset can release the fields listed above.