SH7052 Datasheet, PDF (496/919 Pages) Renesas Technology Corp – SuperHTM RISC engine

Initialization
1
Start of transmission
Read TDRE bit in SSR
2
No
TDRE = 1?
Yes
Write transmit data to TDR
and clear TDRE bit in SSR to 0
All data transmitted?
3
No
Yes
Read TEND bit in SSR
No
TEND = 1?
Yes
Output break signal?
Yes
Clear port DR to 0
No
4
Clear TE bit in SCR to 0;
select theTxD pin as an
output port with the PFC
End of transmission
Figure 14.5 Sample Flowchart for Transmitting Serial Data
470