36.5.16.2.2 Interrupt Freeze

Setting PIO_IOFRx.FINT freezes the following fields (configured in PIO_CFGRx) of the Non-Secure I/O lines if the corresponding MSKx bit is set 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 the S_PIO_MSKRx to freeze the fields above.

When the “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 fields listed above.