Rev. 1.0, 09/02, page 410 of 568
16.3.3
SS Mode Register (SSMR)
SSMR selects the MSB first/LSB first, clock phase, clock polarity, and clock rate of synchronous
serial communication.
Bit
Bit Name
Initial Value
R/W
Description
7 MLS
0
R/W MSB
First/LSB
First
Selects the serial data is transmitted in MSB first
or LSB first.
0: LSB first
1: MSB first
6 CPOS
0
R/W Clock
Polarity
Selection
Selects SSCK clock polarity.
0: High output in idle mode, and low output in
active mode
1: Low output in idle mode, and high output in
active mode
5 CPHS
0
R/W Clock
Phase
Selection
Selects SSCK clock phase.
0: Data changes at the first edge.
1: Data is latched at the first edge.
4, 3
All
0
Reserved
The write value should always be 0.
2
1
0
CKS2
CKS1
CKS0
0
0
0
R/W
R/W
R/W
Transfer Clock Rate Selection
Select the transfer clock rate (prescaler division
rate) when an internal clock is selected.
000:
φ
/2
001:
φ
/4
010:
φ
/8
011:
φ
/16
100:
φ
/32
101:
φ
/64
110:
φ
/128
111:
φ
/256
Содержание H8S/2627
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