HD6433832S Datasheet, PDF (295/560 Pages) Renesas Technology Corp – single-chip microcomputers

Data Transmit/Receive Operations
SCI3 Initialization: Before transmitting or receiving data, follow the SCI3 initialization
procedure explained under 10.4.4, SCI3 Initialization, and illustrated in figure 10.10.
Transmitting: Figure 10.17 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 (SSR),
and after confirming that bit TDRE = 1,
write transmit data in the transmit
TDRE = 1?
data register (TDR).
No
When data is written to TDR, TDRE is
automatically cleared to 0 and data
Yes
transmission begins.
If clock output has been selected, after
data is written to TDR, the clock is
Write transmit data in TDR
output and data transmission begins.
Yes
2
Continue data transmission?
2. To continue transmitting data, read
No
bit 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.
No
TEND = 1?
Yes
Write 0 to bit TE in SCR3
End
Figure 10.17 Typical Data Transmission Flow Chart in Synchronous Mode
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