Rainbow Electronics AT75C220 - Manual (Page 126)

AT75C220
126
Data Transfer
Figure 31, Figure 32 and Figure 33 show examples of data transfers.
Figure 31. SPI Transfer Format (NPCHA Equals One, Eight Bits per Transfer)
Figure 32. SPI Transfer Format (NCPHA Equals Zero, Eight Bits per Transfer)
SPCK
(CPOL=0)
SPCK
(CPOL=1)
1 2 3 4 5 6 7
MOSI
(from master)
MISO
(from slave)
NPCSS (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 2 3 4 5 6 7
MOSI
(from master)
MISO
(from slave)
NPCSS (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