HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 430

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

Transmitting Multiprocessor Serial Data: Figure 14.13 shows a sample flowchart for
transmitting multiprocessor serial data. Transmission of multiprocessor serial data should be
carried out in the following procedure after setting the SCI in a transmission-enabled state.
Rev. 4.00, 03/04, page 384 of 660
Figure 14.13 Sample Flowchart for Transmitting Multiprocessor Serial Data
Write transmission data to SCTDR
and set MPBT bit in SCSSR
Read TDRE bit in SCSSR
Read TEND bit in SCSSR
Set SCPDR and SCPCR
Clear TE bit SCSCR to 0
Transmission ended?
Clear TDRE bit to 0
Start transmission
End transmission
Break output?
TDRE = 1?
TEND = 1?
Yes
Yes
Yes
Yes
No
No
No
No
1.
2.
3.
SCI status check and transmit
data write: Read the SCSSR,
check that the TDRE bit is 1,
then write transmit data in the
SCTDR. Also set MPBT
(multiprocessor bit transfer) to
0 or 1 in SCSSR. Finally, 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.
To output a break at the end of
serial transmission: Set the
SCPDR and SCPCR, then clear
the TE bit to 0 in SCSCR. For
SCPCR and SCPDR settings,
see section 14.3.8, SC Port Control
Register (SCPCR), and section
14.3.9, SC Port Data Register
(SCPDR).