HD6417750RF240V Datasheet, PDF (415/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 14 Serial Communication Interface (SCI)
Transmission
All data transmitted?
Yes
Read TEND flag in SSR
No [1]
No
TEND = 1
Yes
TE = 0
[2]
Make transition to software standby mode etc.
[3]
Cancel software standby mode etc.
[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] Module stop, watch, sub-active,
and sub-sleep modes are
included.
Change operating mode?
Yes
Initialization
No
TE = 1
Start transmission
Figure 14.34 Sample Flowchart for Mode Transition during Transmission
Transmission start
Transmission end
Transition to
software standby
mode
Software standby
mode cancelled
TE bit
SCK
output pin
TxD
output pin
Port
input/output
Port
High output
Start
SCI TxD output
Stop
Port
input/output
Port input/output
Port
High output
SCI
TxD output
Figure 14.35 Pin States during Transmission in Asynchronous Mode (Internal Clock)
Rev. 7.00 Sep. 11, 2009 Page 379 of 566
REJ09B0211-0700