HD6433832S Datasheet, PDF (289/560 Pages) Renesas Technology Corp – single-chip microcomputers

Transmitting: Figure 10.12 shows a typical flow chart for data transmission. After SCI3
initialization, follow the procedure below.
Start
1
Read bit TDRE in SSR
1. Read the serial status register (SRR),
and after confirming that bit TDRE = 1,
write transmit data in the transmit data
TDRE = 1?
No
register (TDR). When data is written to
TDR, TDRE is automatically cleared to 0.
Yes
Write transmit data in TDR
Continue
Yes
2
data transmission?
2. To continue transmitting data, read bit TDRE
No
to make sure it is set to 1, then write the
next data to TDR. When data is written to
Read bit TEND in SSR
TDR, TDRE is automatically cleared to 0.
No
TEND = 1?
Yes
No
3
Break output?
3. To output a break signal when transmission
Yes
ends, first set the port values PCR = 1 and
PDR = 0, then clear bit TE in SCR3 to 0.
Set PDR = 0 and PCR = 1
Clear bit TE in SCR3 to 0
End
Figure 10.12 Typical Data Transmission Flow Chart (Asynchronous Mode)
SCI3 operates as follows during data transmission.
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