Figure 12.21 Sample Flowchart For Mode Transition During Transmission; Figure 12.22 Pin States During Transmission In Asynchronous Mode (Internal Clock) - Renesas H8S/2111B Hardware Manual

Read TEND flag in SSR
Make transition to software standby mode etc.
Cancel software standby mode etc.
Change operating mode?

Figure 12.21 Sample Flowchart for Mode Transition during Transmission

TE bit
SCK
output pin
TxD
Port
input/output
output pin
Port

Figure 12.22 Pin States during Transmission in Asynchronous Mode (Internal Clock)

Rev. 1.00, 05/04, page 274 of 544
Transmission
All data transmitted?
Yes
TEND = 1
Yes
TE = 0
[2]
Yes
Initialization
Start transmission
Transmission start
High output Start
SCI TxD output
[1]
No
[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.
No
[2] Also clear TIE and TEIE to 0
when they are 1.
[3] Module stop, watch, sub-active,
and sub-sleep modes are
included.
[3]
No
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