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ATSAM4S-XPLD

518

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

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.

Figure 30-10.Parallel Capture Mode Waveforms (DSIZE = 2, ALWYS = 0, HALFS = 0)

Figure 30-11.Parallel Capture Mode Waveforms (DSIZE=2, ALWYS=1, HALFS=0)

0x23

0x34

0x45

0x12

0x56

0x67

0x78

0x89

0x5645_3423

MCK

PIODCCLK

PIODC[7:0]

PIODCEN1

PIODCEN2

DRDY (PIO_PCISR)

RDATA (PIO_PCRHR)

0x01

Read of PIO_PCISR