PCINT13 datasheet(151/294 Pages) ATMEL

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151

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

13.3

Data Modes

There are four combinations of SCK phase and polarity with respect to serial data, which are

determined by control bits CPHA and CPOL. The SPI data transfer formats are shown in Fig-

ure 13-3 and Figure 13-4. Data bits are shifted out and latched in on opposite edges of the

SCK signal, ensuring sufficient time for data signals to stabilize. This is clearly seen by sum-

marizing Table 13-2 and Table 13-3, as done below:

Figure 13-3. SPI Transfer Format with CPHA = 0

Figure 13-4. SPI Transfer Format with CPHA = 1

Table 13-5.

CPOL Functionality

Leading Edge

Trailing Edge

SPI Mode

CPOL=0, CPHA=0

Sample (Rising)

Setup (Falling)

CPOL=0, CPHA=1

Setup (Rising)

Sample (Falling)

CPOL=1, CPHA=0

Sample (Falling)

Setup (Rising)

CPOL=1, CPHA=1

Setup (Falling)

Sample (Rising)

Bit 1

Bit 6

LSB

MSB

SCK (CPOL = 0)

mode 0

SAMPLE I

MOSI/MISO

CHANGE 0

MOSI PIN

CHANGE 0

MISO PIN

SCK (CPOL = 1)

mode 2

MSB

LSB

Bit 6

Bit 1

Bit 5

Bit 2

Bit 4

Bit 3

Bit 4

Bit 2

Bit 5

MSB first (DORD = 0)

LSB first (DORD = 1)

SCK (CPOL = 0)

mode 1

SAMPLE I

MOSI/MISO

CHANGE 0

MOSI PIN

CHANGE 0

MISO PIN

SCK (CPOL = 1)

mode 3

MSB

LSB

Bit 6

Bit 1

Bit 5

Bit 2

Bit 4

Bit 3

Bit 4

Bit 2

Bit 5

Bit 1

Bit 6

LSB

MSB

MSB first (DORD = 0)

LSB first (DORD = 1)

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