Datasheet

Table Of Contents
Section 13 Serial Communication Interface
REJ09B0140-0900 Rev. 9.00 Page 467 of 846
Sep 16, 2010
H8S/2215 Group
TE bit
SCK output pin
TxD output pin Port input/output High output
Final TxD
bit retention
Port input/output
PortPort SCI TxD output
SCI TxD
output
High output*
Port input/output
Start of transmission
End of
transmission
Transition
to software
standby
Exit from
software
standby
Note: * Initialized by the software standby.
Figure 13.42 Port Pin State of Synchronous Transmission Using Internal Clock
Reception
Receive operation should be stopped (by clearing RE to 0) before making a module stop mode,
software standby mode, watch mode, subactive mode, or subsleep mode transition. RSR, RDR,
and SSR are reset. If a transition is made without stopping operation, the data being received
will be invalid.
To continue receiving without changing the reception mode after the relevant mode is cleared,
set RE to 1 before starting reception. To receive with a different receive mode, the procedure
must be started again from initialization.
Figure 13.43 shows a sample flowchart for mode transition during reception.