HD64336900G Datasheet, PDF (238/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Start transmission
[1] Read SSR and check that the TDRE flag is
set to 1, then write transmit data to TDR.
[1]
Read TDRE flag in SSR
When data is written to TDR, the TDRE flag
is automatically cleared to 0 and clocks are
output to start the data transmission.
TDRE = 1
No
[2] To continue serial transmission, be sure to
read 1 from the TDRE flag to confirm that
writing is possible, then write data to TDR.
Yes
When data is written to TDR, the TDRE flag
is automatically cleared to 0.
Write transmit data to TDR
Yes
[2]
All data transmitted?
No
Read TEND flag in SSR
No
TEND = 1
Yes
Clear TE bit in SCR3 to 0
<End>
Figure 14.12 Sample Serial Transmission Flowchart (Clocked Synchronous Mode)
Rev. 1.00, 11/03, page 210 of 376