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Section 13 Serial Communication Interface (SCI)
All data transmitted?
Read TEND flag in SSR
Make transition to software standby mode etc.
Cancel software standby mode etc.
Change operating mode?
Start transmission
Figure 13.34 Sample Flowchart for Mode Transition during Transmission
TE bit
SCK
output pin
TxD
Port
input/output
output pin
Port
Figure 13.35 Pin States during Transmission in Asynchronous Mode
Rev. 1.00 Mar. 12, 2008 Page 492 of 1178
REJ09B0403-0100
Transmission
No
Yes
No
TEND = 1
Yes
TE = 0
[2]
No
Yes
Initialization
Transmission start
High output
Start
SCI TxD output
(Internal Clock)
[1]
[1] Data being transmitted is lost
halfway. Data can be normally
transmitted from the CPU by
setting TE to 1, reading SSR,
writing to TDR, and clearing
TDRE to 0 after mode
cancellation; however, if the DTC
has been initiated, the data
remaining in DTC RAM will be
transmitted when TE and TIE are
set to 1.
[2] Also clear TIE and TEIE to 0
when they are 1.
[3]
[3] Module stop mode is included.
TE = 1
Transmission end
Stop
Transition to
Software standby
software standby
mode cancelled
mode
Port
input/output
Port input/output
High output
Port
TxD output
SCI
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