HD6437020 Datasheet, PDF (383/507 Pages) Hitachi Semiconductor – SuperH™ RISC engine

Initialize
(1)
Start transmitting
Read TDRE bit in SSR
(2)
No
TDRE = 1?
Yes
Write transmit data in TDR and
clear TDRE bit to 0 in SSR
(3)
No
All data transmitted?
Yes
Read TEND bit in SSR
No
TEND = 1?
Yes
Output break signal?
Yes
Set DR = 0
No
(4)
Clear TE bit of SCR to 0;
Select theTxD pin function
as an output port with the PFC
Transmission ends
Note: Circled numbers refer to the preceding procedure.
Figure 13.5 Sample Flowchart for Transmitting Serial Data
HITACHI 370