Datasheet

Section 17 Synchronous Serial Communication Unit (SSU)
Rev. 2.00 Aug. 20, 2008 Page 568 of 1198
REJ09B0403-0200
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. 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 17.2 to 17.4.
Table 17.2 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)