h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 289

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

and clear TDRE flag in SSR to 0
Write transmit data to TDR
Read TDRE flag in SSR
Read TEND flag in SSR
Clear TE bit in SCR to 0
All data transmitted?
Clear DR to 0 and
Start transmission
Break output?
set DDR to 1
Initialization
TDRE = 1
TEND = 1
Figure 12.7 Sample Serial Transmission Flowchart
<End>
Yes
Yes
Yes
Yes
No
No
No
No
[1]
[2]
[3]
[4]
[1]
[2]
[3]
[4]
SCI initialization:
The TxD pin is automatically designated
as the transmit data output pin.
After the TE bit is set to 1, a frame of 1s
is output, and transmission is enabled.
SCI status check and transmit data
write:
Read SSR and check that the TDRE flag
is set to 1, then write transmit data to
TDR and clear the TDRE flag to 0.
Serial transmission continuation
procedure:
To continue serial transmission, read 1
from the TDRE flag to confirm that
writing is possible, then write data to
TDR, and clear the TDRE flag to 0.
Break output at the end of serial
transmission:
To output a break in serial transmission,
set DDR for the port corresponding to
the TxD pin to 1, clear DR to 0, then
clear the TE bit in SCR to 0.
Rev. 1.00, 05/04, page 255 of 544