HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 417

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Write transmit data to TDR and
clear TDRE flag in SSR to 0
Clear TE bit in SCR to 0
Read TDRE flag in SSR
Read TEND flag in SSR
All data transmitted?
Start transmission
Initialization
TDRE = 1
TEND = 1
<End>
Figure 15.17 Sample Serial Transmission Flowchart
Yes
Yes
Yes
No
No
No
[3]
[2]
[1]
[1] SCI initialization:
[2] SCI status check and transmit data
[3] Serial transmission continuation
The TxD pin is automatically
designated as the transmit data output
pin.
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.
procedure:
To continue serial transmission, be
sure to read 1 from the TDRE flag to
confirm that writing is possible, then
write data to TDR, and then clear the
TDRE flag to 0.
However, the TDRE flag is checked
and cleared automatically when the
DTC is initiated by a transmit data
empty interrupt (TXI) request and
writes data to TDR.
Rev. 2.0, 08/02, page 377 of 788