SAM3SD8B Atmel Corporation, SAM3SD8B Datasheet - Page 512

• Manufacturer Part Number: SAM3SD8B
• Manufacturer: Atmel Corporation

Figure 27-10. Parallel Capture Mode Waveforms (DSIZE = 2, ALWYS = 0, HALFS = 0)
512
512
RDATA (PIO_PCRHR)
Read of PIO_PCISR
DRDY (PIO_PCISR)
PIODC[7:0]
PIODCEN1
PIODCEN2
PIODCCLK
SAM3S8/SD8
SAM3S8/SD8
MCK
0x01
set to 1, the parallel capture mode samples the sensor data at the rising edge of the sensor
clock whichever the data enable signals are.
The parallel capture mode can sample the sensor data only one time out of two. This is particu-
larly useful when the user wants only to sample the luminance Y of a CMOS digital image sensor
which outputs a YUV422 data stream. If the HALFS bit is set to 0 in PIO_PCMR, the parallel
capture mode samples the sensor data in the conditions described above. If the HALFS bit is set
to 1 in PIO_PCMR, the parallel capture mode samples the sensor data in the conditions
described above, but only one time out of two. Depending on the FRSTS bit in PIO_PCMR, the
sensor can either sample the even or odd sensor data. If sensor data are numbered in the order
that they are received with an index from 0 to n, if FRSTS = 0 then only data with an even index
are sampled, if FRSTS = 1 then only data with an odd index are sampled. If data is ready in
PIO_PCRHR and it is not read before a new data is stored in PIO_PCRHR, then an overrun
error occurs. The previous data is lost and the OVRE flag in PIO_PCISR is set to 1. This flag is
automatically reset when PIO_PCISR is read (reset after read).
The flags DRDY, OVRE, ENDRX and RXBUFF can be a source of the PIO interrupt.
0x12
0x23
0x34
0x45
0x56
0x67
0x5645_3423
0x78
0x89
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12