HD6473837H Datasheet, PDF (304/562 Pages) Renesas Technology Corp – Hardware Manual

Transmitting Multiprocessor Data: Figure 10.23 shows a typical flow chart for multiprocessor
serial data transmission. After SCI3 initialization, follow the procedure below.
Start
1
Read bit TDRE in SSR
1. Read the serial status register (SSR), and
after confirming that bit TDRE = 1, set bit
TDRE = 1?
MPBT (multiprocessor bit transmit) in SSR
No
to 0 or 1, then write transmit data in the
transmit data register (TDR).
Yes
When data is written to TDR, TDRE is
Set bit MPBT in SSR
automatically cleared to 0.
Write transmit data to TDR
Continue
Yes
2
transmitting?
2. To continue transmitting data, read bit
No
TDRE to make sure it is set to 1, then
write the next data to TDR.
When data is written to TDR, TDRE
Read bit TEND in SSR
is automatically cleared to 0.
TEND = 1?
No
3. To output a break signal at the end of data
Yes
transmission, first set the port values
PCR = 1 and PDR = 0, then clear bit TE
3
Break output?
No
in SCR3 to 0.
Yes
Set PDR = 0 and PCR = 1
Clear bit TE in SCR3 to 0
End
Figure 10.23 Typical Multiprocessor Data Transmission Flow Chart
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