HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 408

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

12. Serial Communication Interface
Rev.4.00 Aug. 20, 2007 Page 364 of 638
REJ09B0395-0400
Clear DR bit to 0 and set DDR to 1
Figure 12.10 Sample Flowchart for Transmitting Multiprocessor Serial Data
Write transmit data in TDR
and set MPBT bit in SSR
Clear TE bit to 0 in SCR
Read TDRE flag in SSR
Read TEND flag in SSR
Output break signal?
All data transmitted?
Clear TDRE flag to 0
Start transmitting
TDRE = 1
TEND = 1
Initialize
<End>
Yes
Yes
Yes
Yes
No
No
No
No
(4)
(1)
(2)
(3)
(1)
(2)
(3)
(4)
SCI initialization:
the transmit data output function of
the TxD pin is selected automatically.
SCI status check and transmit data
write:
read SSR, check that the TDRE flag is
1, then write transmit data in TDR.
Also set the MPBT flag to 0 or 1 in
SSR. Finally, 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.