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Section 13 Serial Communication Interface (SCI)
Read TEND flag in SSR
software standby mode
Cancel software standby mode
Change operating mode?
Figure 13.34 Sample Flowchart for Transition to Software Standby Mode during
TE bit
SCK
output pin
TxD
Port
output pin
input/output
Port
Figure 13.35 Port Pin States during Transition to Software Standby Mode
Rev.2.00 Jun. 28, 2007 Page 522 of 666
REJ09B0311-0200
Transmission
All data transmitted?
Yes
TEND = 1
Yes
TE = 0
[2]
Make transition to
Yes
Initialization
Start transmission
Transmission
Transmission start
High output
Start
SCI TxD output
(Internal Clock, Asynchronous Transmission)
[1]
No
[1] Data being transmitted is lost
halfway. Data can be normally
transmitted from the CPU by
setting the TE bit to 1, reading
SSR, writing to TDR, and
clearing the TDRE bit to 0 after
clearing software standby mode;
however, if the DTC has been
No
activated, the data remaining in
the DTC will be transmitted when
both the TE and TIE bits are set
to 1.
[2] Clear the TIE and TEIE bits to 0
when they are 1.
[3]
[3] Setting of the module stop state
is included.
No
TE = 1
Transmission end
Stop
Transition to
Software standby
software standby
mode canceled
mode
Port
input/output
Port input/output
High output
Port
TxD output
SCI
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