H8S2114R Datasheet, PDF (548/1038 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2100 Series

Section 15 Serial Communication Interface (SCI, IrDA)
TE and TIE to 1 after mode cancellation generates a TXI interrupt request to start transmission
using the DTC.
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 15.36 Sample Flowchart for Mode Transition during Transmission
Rev. 3.00 Jul. 14, 2005 Page 500 of 986
REJ09B0098-0300