Advertisement
17.3.3
SS Mode Register (SSMR)
SSMR selects the MSB first/LSB first, clock polarity, clock phase, and clock rate of synchronous
serial communication.
Bit
Bit Name
7
MLS
6
CPOS
5
CPHS
4, 3
2
CKS2
1
CKS1
0
CKS0
Initial
Value
R/W
0
R/W
0
R/W
0
R/W
All 0
R/W
0
R/W
0
R/W
0
R/W
Section 17 Synchronous Serial Communication Unit (SSU)
Description
MSB First/LSB First Select
Selects that the serial data is transmitted in MSB first or
LSB first.
0: LSB first
1: MSB first
Clock Polarity Select
Selects the 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
Clock Phase Select (Only for SSU Mode)
Selects the SSCK clock phase.
0: Data changes at the first edge.
1: Data is latched at the first edge.
Reserved
These bits are always read as 0. The initial value
should not be changed.
Transfer Clock Rate Select
Select the transfer clock rate (prescaler division rate)
when an internal clock is selected.
000: Reserved
001: φ/4
010: φ/8
011: φ/16
Rev. 1.00 Mar. 12, 2008 Page 557 of 1178
100: φ/32
101: φ/64
110: φ/128
111: φ/256
REJ09B0403-0100
Advertisement
