Datasheet

Section 12 Serial Communication Interface
Rev.7.00 Dec. 24, 2008 Page 444 of 698
REJ09B0074-0700
Read TEND flag in SSR
TE= 0
Transition to software
standby mode, etc.
Exit from software
standby mode, etc.
Change
operating mode?
No
All data
transmitted?
TEND = 1
Yes
Yes
Yes
<Transmission>
No
No
[1]
[3]
[2]
TE = 1Initialization
<Start of transmission>
Data being transmitted is interrupted.
After exiting software standby
mode, etc., normal CPU transmission
is possible by setting TE to 1, reading
SSR, writing TDR, and clearing TDRE
to 0.
If TIE and TEIE are set to 1, clear
them to 0 in the same way.
Includes module stop mode, watch mode,
subactive mode, and subsleep mode.
[1]
[2]
[3]
Figure 12.39 Sample Flowchart for Mode Transition during Transmission
SCK output pin
TE bit
TxD output pin
Port input/output High outputPort 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 12.40 Port Pin State of Asynchronous Transmission Using Internal Clock