SAM7X256_14 Datasheet, PDF (248/662 Pages) ATMEL Corporation – ARM-based Flash MCU

Figure 28-3. SPI Transfer Format (NCPHA = 1, 8 bits per transfer)
SPCK cycle (for reference)
1
2
3
4
5
6
7
8
SPCK
(CPOL = 0)
SPCK
(CPOL = 1)
MOSI
(from master)
MSB
6
5
4
3
2
1
LSB
MISO
(from slave)
MSB
6
5
4
3
2
1
LSB
*
NSS
(to slave)
* Not defined, but normally MSB of previous character received.
Figure 28-4. SPI Transfer Format (NCPHA = 0, 8 bits per transfer)
SPCK cycle (for reference)
1
SPCK
(CPOL = 0)
2
3
4
5
6
7
8
SPCK
(CPOL = 1)
MOSI
(from master)
MSB
6
5
4
3
2
1
LSB
MISO
(from slave)
*
MSB
6
5
4
3
2
1
LSB
NSS
(to slave)
* Not defined but normally LSB of previous character transmitted.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
248