HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 437

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Transmitting Serial Data (Clock Synchronous Mode): Figure 14.19 shows a sample flowchart
for transmitting serial data. Transmission of serial data should be carried out in the following
procedure after setting the SCI in a transmission-enabled state.
Write transmission data to SCTDR
and clear TDRE bit in SCSSR to 0
Figure 14.19 Sample Flowchart for Serial Transmitting
Clear TE bit in SCSCR to 0
Read TDRE bit in SCSSR
Read TEND bit in SCSSR
All data transmitted?
Start transmission
End transmission
TDRE = 1?
TEND = 1?
Yes
Yes
Yes
No
No
No
1.
2.
SCI status check and transmit data
write: Read the serial status register
(SCSSR), check that the TDRE bit is
1, then write transmit data in the
transmit data register (SCTDR) and
clear TDRE to 0.
To continue transmitting serial data:
Read the TDRE bit to check whether
it is safe to write (if it reads 1); if so,
write data in SCTDR, then clear
TDRE to 0.
Rev. 4.00, 03/04, page 391 of 660