Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
628
Figure 31-8. Input Change Interrupt Timings if there are no Additional Interrupt Modes
31.5.11 I/O Lines Lock
When an I/O line is controlled by a peripheral (particularly the Pulse Width Modulation Controller PWM), it can
become locked by the action of this peripheral via an input of the PIO controller. When an I/O line is locked, the
write of the corresponding bit in the registers PIO_PER, PIO_PDR, PIO_MDER, PIO_MDDR, PIO_PUDR,
PIO_PUER and PIO_ABSR is discarded in order to lock its configuration. The user can know at anytime 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 an hardware reset to the PIO Controller.
MCK
Pin Level
Read PIO_ISR
APB Access
PIO_ISR
APB Access