Datasheet

621
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
31.5 Functional Description
The PIO Controller features up to 32 fully-programmable I/O lines. Most of the control logic associated to each I/O
is represented in Figure 31-3. In this description each signal shown represents but one of up to 32 possible
indexes.
Figure 31-3. I/O Line Control Logic
1
0
1
0
1
0
1
0
DQ DQ
DFF
1
0
1
0
1
0
1
0
Programmable
Glitch
or
Debouncing
Filter
Peripheral A
Input
PIO_PDSR[0]
PIO_ISR[0]
PIO_IDR[0]
PIO_IMR[0]
PIO_IER[0]
PIO Interrupt
(Up to 32 possible inputs)
PIO_ISR[31]
PIO_IDR[31]
PIO_IMR[31]
PIO_IER[31]
Pad
PIO_PUDR[0]
PIO_PUSR[0]
PIO_PUER[0]
PIO_MDDR[0]
PIO_MDSR[0]
PIO_MDER[0]
PIO_CODR[0]
PIO_ODSR[0]
PIO_SODR[0]
PIO_PDR[0]
PIO_PSR[0]
PIO_PER[0]
PIO_ABSR[0]
PIO_ODR[0]
PIO_OSR[0]
PIO_OER[0]
Resynchronization
Stage
Peripheral B
Input
Peripheral B
Output Enable
Peripheral A
Output Enable
Peripheral B
Output
Peripheral A
Output
EVENT
DETECTOR
DFF
PIO_IFDR[0]
PIO_IFSR[0]
PIO_IFER[0]
System Clock
Clock
Divider
PIO_IFSCR[0]
PIO_DCIFSR[0]
PIO_SCIFSR[0]
PIO_SCDR
Slow Clock