Atmel SAM4S-EK2 Atmel ATSAM4S-EK2 ATSAM4S-EK2 Data Sheet
Product codes
ATSAM4S-EK2
601
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
show examples of data transfers.
Figure 32-3. SPI Transfer Format (NCPHA = 1, 8 bits per transfer)
Figure 32-4. SPI Transfer Format (NCPHA = 0, 8 bits per transfer)
6
*
SPCK
(CPOL = 0)
SPCK
(CPOL = 1)
MOSI
(from master)
MISO
(from slave)
NSS
(to slave)
SPCK cycle (for reference)
MSB
MSB
LSB
LSB
6
6
5
5
4
4
3
3
2
2
1
1
* Not defined, but normally MSB of previous character received.
1
2
3
4
5
7
8
6
*
SPCK
(CPOL = 0)
SPCK
(CPOL = 1)
1
2
3
4
5
7
MOSI
(from master)
MISO
(from slave)
NSS
(to slave)
SPCK cycle (for reference)
8
MSB
MSB
LSB
LSB
6
6
5
5
4
4
3
3
1
1
* Not defined but normally LSB of previous character transmitted.
2
2
6