Wiznet W7500 Reference Manual page 381

res res res res
15 14 13 12
[3:0] DSS – Data size select:
0000 : reserved, undefined operation
0001 : reserved, undefined operation
0010 : reserved, undefined operation
0011 : 4-bit data
0100 : 5-bit data
0101 : 6-bit data
0110 : 7-bit data
0111 : 8-bit data
1000 : 9-bit data
1001 : 10-bit data
1010 : 11-bit data
1011 : 12-bit data
1100 : 13-bit data
1101 : 14-bit data
1111 : 15-bit data
[5:4] FRF – Frame Format
00 : Motorola SPI frame format
01 : TI synchronous serial frame format
10 : National Microwire frame format
11 : Reserved, undefined operation
[6] SPO – SSPCLKOUT polarity
This is applicable to Motorola SPI frame format only.
[7] SPH – SSPCLKOUT phase
This is applicable to Motorola SPI frame format only.
[15:8] SCR – Serial clock rate
The value SCR is used to generate the transmit and receive bit rate of the SSP. The bit
rate is:
fSSPCLK / (CPSDVSR * (1 + SCR))
where
CPSDVSR is an even value from 2-254, programmed through the SSPCPSR register and
SCR is a value from 0-255.
W7500x Reference Manual Version1.1.0
res res res
11 10 9
SCR
R/W
res res res res
8 7 6 5
SPH SPO
R/W R/W
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4 3 2
FRF DSS
R/W R/W
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1 0