SH7055S Datasheet, PDF (526/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

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 15.5 Sample Flowchart for Transmitting Serial Data
Rev.2.0, 07/03, page 488 of 960