32.5.11 I/O Lines Lock

When an I/O line is controlled by a peripheral (particularly the Pulse-Width Modulation (PWM) Controller), it can become locked by the action of this peripheral through an input of the PIO Controller. When an I/O line is locked, the write of the corresponding bit in the PIO_PER, PIO_PDR, PIO_MDER, PIO_MDDR, PIO_PUDR, PIO_PUER, PIO_ABCDSR0 and PIO_ABCDSR1 is discarded to lock its configuration. The user can know at any time which I/O line is locked by reading the PIO Lock Status Register (PIO_LOCKSR). Once an I/O line is locked, the only way to unlock it is to apply a hardware reset to the PIO Controller.