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SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
Figure 30-12.Parallel Capture Mode Waveforms (DSIZE=2, ALWYS=0, HALFS=1, FRSTS=0)
Figure 30-13.Parallel Capture Mode Waveforms (DSIZE=2, ALWYS=0, HALFS=1, FRSTS=1)
30.5.13.3Restrictions
) 
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 2 times the frequency of the clock of the device which 
generates the parallel data.
30.5.13.4Programming 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. 
0x23
0x34
0x45
0x12
0x56
0x67
0x78
0x89
0x6745_2301
MCK
PIODCCLK
PIODC[7:0]
PIODCEN1
PIODCEN2
DRDY (PIO_PCISR)
RDATA (PIO_PCRHR)
0x01
Read of  PIO_PCISR
0x23
0x34
0x45
0x12
0x56
0x67
0x78
0x89
0x7856_3412
MCK
PIODCCLK
PIODC[7:0]
PIODCEN1
PIODCEN2
DRDY (PIO_PCISR)
RDATA (PIO_PCRHR)
0x01
Read of  PIO_PCISR