Datasheet

Section 22 Synchronous Serial Communication Unit (SSU)
REJ09B0465-0300 Rev. 3.00 Page 783 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
22.3.4 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. Table 22.2 shows the
relationship between communication modes and the input/output pins. In bidirectional
communication mode, the TE and RE bits should not be set to 1 at the same time.
Table 22.2 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.