655
SCK output pin
TE bit
TxD output pin
Port input/output
High output
Port input/output
High output
Start
Stop
Start of transmission
End of
transmission
Port input/output
SCI TxD output
Port
SCI TxD
output
Port
Transition
to software
standby
Exit from
software
standby
Figure 16-26 Asynchronous Transmission Using Internal Clock
Port input/output
Last TxD bit held
High output
*
Port input/output
Marking output
Port input/output
SCI TxD output
Port
Port
Note:
*
Initialized by software standby.
SCK output pin
TE bit
TxD output pin
SCI TxD
output
Start of transmission
End of
transmission
Transition
to software
standby
Exit from
software
standby
Figure 16-27 Synchronous Transmission Using Internal Clock