Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

Product codes

ATSAM4S-WPIR-RD

571

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

Figure 31-12. Parallel Capture Mode Waveforms (DSIZE=2, ALWYS=0, HALFS=1, FRSTS=0)

Figure 31-13. Parallel Capture Mode Waveforms (DSIZE=2, ALWYS=0, HALFS=1, FRSTS=1)

31.5.13.3Restrictions



Configuration fields DSIZE, ALWYS, HALFS and FRSTS in PIO_PCMR can be changed ONLY if the parallel

capture mode is disabled at this time (PCEN = 0 in PIO_PCMR).



Frequency of PIO Controller clock must be strictly superior to two times the frequency of the clock of the

device which generates the parallel data.

31.5.13.4Programming Sequence

Without PDC

1. Write PIO_PCIDR and PIO_PCIER in order to configure the parallel capture mode interrupt mask.

2. Write PIO_PCMR to set the fields DSIZE, ALWYS, HALFS and FRSTS in order to configure the parallel

capture mode WITHOUT enabling the parallel capture mode.

3. Write PIO_PCMR to set the PCEN bit to one in order to enable the parallel capture mode WITHOUT

changing the previous configuration.

4. Wait for a data ready by polling the DRDY flag in PIO_PCISR or by waiting for the corresponding interrupt.
5. Check OVRE flag in PIO_PCISR.

0x23

0x34

0x45

0x12

0x56

0x67

0x78

0x89

0x6745_2301

PIODCCLK

PIODC[7:0]

PIODCEN1

PIODCEN2

DRDY (PIO_PCISR)

RDATA (PIO_PCRHR)

0x01

Read of PIO_PCISR

MCK