SH7137 Datasheet, PDF (645/1160 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 15 Synchronous Serial Communication Unit (SSU)
15.4.4 Communication Modes and Pin Functions
The SSU switches the input/output pin (SSI, SSO, SSCK, and SCS) functions according to the
communication modes and register settings. The input/output directions of the pins should be
selected in the port I/O registers. The relationship of communication modes and input/output pin
functions are shown in tables 15.5 to 15.7.
Table 15.5 Communication Modes and Pin States of SSI and SSO Pins
Communication
Register Setting
Pin State
Mode
SSUMS BIDE MSS TE
RE
SSI
SSO
SSU communication 0
0
0
0
1

Input
mode
1
0
Output 
1
Output Input
1
0
1
Input

1
0

Output
1
Input
Output
SSU (bidirectional) 0
1
0
0
1

Input
communication mode
1
0

Output
1
0
1

Input
1
0

Output
Clock synchronous 1
0
0
0
1
Input

communication mode
1
0

Output
1
Input
Output
1
0
1
Input

1
0

Output
1
Input
Output
[Legend]
: Not used as SSU pin
Rev. 2.00 Sep. 10, 2008 Page 619 of 1130
REJ09B0402-0200