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Section 14 Synchronous Serial Communication Unit (SSU)
Rev. 3.00 Mar. 14, 2006 Page 528 of 804
REJ09B0104-0300
14.4.4 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. When a pin is used as an input pin, set the
corresponding bit in the input buffer control register (ICR) to 1. The relationship of
communication modes and input/output pin functions are shown in tables 14.2 to 14.4.
Table 14.4 Communication Modes and Pin States of SSI and SSO Pins
Register Setting
Pin State
Communication
Mode
SSUMS BIDE
MSS
TE
RE
SSI
SSO
0 0 0 0 1
Input
SSU communication
mode
1
0
Output
1
Output
Input
1 0 1 Input
1
0
Output
1
Input
Output
0 1 0 0 1
Input
SSU (bidirectional)
communication mode
1
0
Output
1 0 1
Input
1
0
Output
1 0 0 0 1 Input
Clock synchronous
communication mode
1
0
Output
1
Input
Output
1 0 1 Input
1
0
Output
1
Input
Output
[Legend]
: Not used as SSU pin (can be used as I/O port)
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