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1745D–ATARM–04-Nov-05
AT91M55800A
20.4 Data Transfer
The following waveforms show examples of data transfers.
Figure 20-3. SPI Transfer Format (NCPHA equals One, 8 bits per transfer)
Figure 20-4. SPI Transfer Format (NCPHA equals Zero, 8 bits per transfer)
SPCK
(CPOL=0)
SPCK
(CPOL=1)
1
234
5
67
MOSI
(from master)
MISO
(from slave)
NSS (to slave)
SPCK cycle (for reference)
8
MSB
MSB
LSB
LSB
6
6
6
5
5
4
4
3
3
2
2
1
1
X
SPCK
(CPOL=0)
SPCK
(CPOL=1)
1
234
5
67
MOSI
(from master)
MISO
(from slave)
NSS (to slave)
SPCK cycle (for reference)
8
MSB
MSB
LSB
LSB
6
6
6
5
5
4
4
3
3
2
2
1
1
X