r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1096

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 20 Synchronous Serial Communication Unit (SSU)
20.3.3
SSMR selects the MSB first/LSB first, clock polarity, clock phase, and clock rate of synchronous
serial communication.
Rev. 1.00 Sep. 19, 2008 Page 1066 of 1342
REJ09B0467-0100
Bit
7
6
5
4, 3
2
1
0
Bit Name
MLS
CPOS
CPHS

CKS2
CKS1
CKS0
SS Mode Register (SSMR)
Initial
Value
0
0
All 0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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
1: Low output in idle mode, and high output in active
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 write value should
always be 0.
Transfer Clock Rate Select
Select the transfer clock rate when an internal clock is
selected.
000: Reserved
001: φ/4
010: φ/8
011: φ/16
mode
mode
100: φ/32
101: φ/64
110: φ/128
111: φ/256