Datasheet

Section 16 Synchronous Serial Communication Unit (SSU)
Rev. 4.00 Mar. 15, 2006 Page 362 of 556
REJ09B0026-0400
16.4.4 Communication Modes and Pin Functions
The SSU switches functions of the input/output pin in each communication mode according to the
settings of the MSS bit in SSCRH and the RE and TE bits in SSER. Figure 16.2 shows the
relationship between communication modes and the input/output pins.
Table 16.2 Relationship between Communication Modes and Input/Output Pins
Register State Pin State
Communication
Mode
SSUMS BIDE MSS TE RE SSI SSO SSCK
0 * 0 0 1 In  In
1 0  Out In
Clocked
Synchronous
Communication
Mode
1 In Out In
1 0 1 In  Out
1 0  Out Out
1 In Out Out
1 0 0 0 1  In In
1 0 Out  In
Four-Line Bus
Communication
Mode
1 Out In In
1 0 1 In  Out
1 0  Out Out
1 In Out Out
1 1 0 0 1  In In
1 0  Out In
1 0 1  In Out
Four-Line Bus
(Bidirectional)
Communication
Mode
1 0  Out Out
[Legend]
: Can be used as a general I/O port.