SH7080_09 Datasheet, PDF (939/1622 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family

Section 17 Synchronous Serial Communication Unit (SSU)
17.4.4 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 17.5 to 17.7.
Table 17.5 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. 4.00 Dec. 15, 2009 Page 879 of 1558
REJ09B0181-0400