SH7014 Datasheet, PDF (371/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

12. Serial Communication Interface (SCI)
Initialize
1
Start transmitting
Read TDRE bit in SSR
2
No
TDRE = 1?
Yes
Write transmission 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
Set DR = 0
No
4
Clear TE bit in SCR to 0;
select theTxD pin as an
output port with the PFC
End transmission
Figure 12.5 Sample Flowchart for Transmitting Serial Data
Rev.5.00 Sep. 27, 2007 Page 337 of 716
REJ09B0398-0500