SH7018 Datasheet, PDF (247/431 Pages) Renesas Technology Corp – SuperH™ RISC engine

Initialize
(1)
Start transmitting
Read TDRE bit in SSR1 (2)
No
TDRE = 1?
Yes
Write transmission data
to TDR1 and clear TDRE bit
in SSR1 to 0
(3)
No
All data transmitted?
Yes
Read TEND bit in SSR1
No
TEND = 1?
Yes
Output break signal?
Yes
Set DR = 0
No
(4)
Clear TE bit in SCR1 to 0;
select theTxD pin as an
output port with the PFC
End transmission
Figure 12.5 Sample Flowchart for Transmitting Serial Data
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