Datasheet

SAM4S Series [DATASHEET]

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

570

that they are received with an index from zero to n, if FRSTS equals zero then only data with an even index are

sampled. If FRSTS equals one, 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 one. 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 31-10. Parallel Capture Mode Waveforms (DSIZE = 2, ALWYS = 0, HALFS = 0)

Figure 31-11. Parallel Capture Mode Waveforms (DSIZE=2, ALWYS=1, HALFS=0)

0x23 0x34 0x450x12 0x56 0x67 0x78 0x89

0x5645_3423

PIODCCLK

PIODC[7:0]

PIODCEN1

PIODCEN2

DRDY (PIO_PCISR)

RDATA (PIO_PCRHR)

0x01

Read of PIO_PCISR

MCK