HD6473847RHV Datasheet, PDF (324/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 10 Serial Communication Interface 3 (SCI3)
Start transmission
Set SPC32 bit in SPCR to 1
[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. When clock
output is selected and data is written to
TDRE = 1
No
TDR, clocks are output to start the data
transmission.
[2] To continue serial transmission, be sure to
Yes
read 1 from the TDRE flag to confirm that
writing is possible, then write data to TDR.
Write transmit data to TDR
When data is written to TDR, the TDRE flag
is automatically cleared to 0.
Yes
[2]
All data transmitted?
No
Read TEND flag in SSR
No
TEND = 1
Yes
Clear TE bit in SCR3 to 0
<End>
Figure 10.11 Sample Serial Transmission Flowchart (Clocked Synchronous Mode)
Rev. 7.00 Mar. 08, 2010 Page 292 of 510
REJ09B0024-0700