HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 401

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

• Transmitting Serial Data (Asynchronous Mode): Figure 12.5 shows a sample flowchart for
transmitting serial data and indicates the procedure to follow.
and clear TDRE flag to 0 in SSR
Write transmit data in TDR
Clear DR bit to 0 and set
Clear TE bit to 0 in SCR
Read TDRE flag in SSR
Read TEND flag in SSR
Output break signal?
All data transmitted?
Start transmitting
DDR bit to 1
TDRE = 1
TEND = 1
Initialize
<End>
Figure 12.5 Sample Flowchart for Transmitting Serial Data
Yes
Yes
Yes
Yes
No
No
No
No
(1)
(2)
(3)
(4)
(1)
(2)
(3)
(4)
Rev.4.00 Aug. 20, 2007 Page 357 of 638
SCI initialization:
the transmit data output function of
the TxD pin is selected automatically.
After the TE bit is set to 1, one frame
of 1s is output, then transmission is
possible.
SCI status check and transmit data
write:
read SSR and check that the TDRE
flag is set to 1, then write transmit data
in TDR and clear the TDRE flag to 0.
To continue transmitting serial data:
after checking that the TDRE flag is 1,
indicating that data can be written,
write data in TDR, then clear the
TDRE flag to 0.
To output a break signal at the end of
serial transmission:
set the DDR bit to 1 and clear the DR
bit to 0, then clear the TE bit to 0 in
SCR.
12. Serial Communication Interface
REJ09B0395-0400