HD6433682 ETC, HD6433682 Datasheet - Page 293

• Manufacturer Part Number: HD6433682
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
• Manufacturer: ETC

Figure 16.6 Sample Serial Transmission Data Flowchart (Asynchronous Mode)
[1]
[2]
[3]
Write transmit data to TDR
Clear TE bit in SCR3 to 0
Read TDRE flag in SSR
Read TEND flag in SSR
All data transmitted?
Clear PDR to 0 and
Start transmission
Break output?
set PCR to 1
TDRE = 1
TEND = 1
<End>
Yes
Yes
Yes
No
Yes
No
No
No
[1] Read SSR and check that the
[2] To continue serial transmission,
[3] To output a break in serial
TDRE flag is set to 1, then write
transmit data to TDR. When data is
written to TDR, the TDRE flag is
automaticaly cleared to 0.
read 1 from the TDRE flag to
confirm that writing is possible,
then write data to TDR. When data
is written to TDR, the TDRE flag is
automaticaly cleared to 0.
transmission, after setting PCR to 1
and PDR to 0, clear TxD in PMR1
to 0, then clear the TE bit in SCR3
to 0.
Rev. 3.00, 05/03, page 263 of 472