h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 516

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 16 Serial Communication Interface (SCI, IrDA, and CRC)
Rev. 3.00 Jan 25, 2006 page 464 of 872
REJ09B0286-0300
TE bit
SCK
output pin
TxD
output pin
Figure 16.40 Pin States during Transmission in Asynchronous Mode (Internal Clock)
Figure 16.39 Sample Flowchart for Mode Transition during Transmission
input/output
Port
Port
Make transition to software standby mode etc.
Cancel software standby mode etc.
Change operating mode?
Read TEND flag in SSR
All data transmitted?
High output
Start transmission
Transmission
Initialization
TEND = 1
Yes
Yes
Yes
TE = 0
Transmission start
[2]
Start
SCI TxD output
No
No
No
TE = 1
[1]
[3]
Transmission end
[1] Data being transmitted is lost
[2] Also clear TIE and TEIE to 0
[3] Module stop, watch, sub-active,
Stop
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 0.
when they are 1.
and sub-sleep modes are
included.
Transition to
software standby
mode
Port input/output
input/output
Port
Port
Software standby
mode cancelled
High output
SCI
TxD output