Samsung S3C2440A User Manual
Page 474
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SPI
S3C2440A RISC MICROPROCESSOR
22-4
SPI TRANSFER FORMAT
The S3C2440A supports 4 different formats to transfer data. Figure 22-2 shows the four waveforms for SPICLK.
*
LSB of previously transmitted character
Cycle
MOSI
1
2
3
4
5
6
7
8
MSB
6
5
4
3
2
1
LSB
6
5
4
3
2
1
LSB
SPICLK
MISO
MSB
CPOL = 1, CPHA = 1 (Format B)
*
MSB of character just received
Cycle
MOSI
1
2
3
4
5
6
7
8
MSB
6
5
4
3
2
1
LSB
6
5
4
3
2
1
LSB
MSB*
SPICLK
MISO
MSB
CPOL = 1, CPHA = 0 (Format A)
Cycle
MOSI
1
2
3
4
5
6
7
8
6
5
4
3
2
1
LSB
6
5
4
3
2
1
LSB*
SPICLK
MISO
*LSB
CPOL = 0, CPHA = 1 (Format B)
*
MSB of character just received
Cycle
MOSI
1
2
3
4
5
6
7
8
MSB
6
5
4
3
2
1
LSB
6
5
4
3
2
1
LSB
MSB*
SPICLK
MISO
MSB
CPOL = 0, CPHA = 0 (Format A)
*
LSB of previously transmitted character
*LSB
MSB
MSB
Figure 22-2 SPI Transfer Format
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