HD6473847RHV Datasheet, PDF (316/546 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 TDRE flag in SSR
No
TDRE = 1
Yes
Write transmit data to TDR
Yes
[2]
All data transmitted?
No
Read TEND flag in SSR
No
TEND = 1
Yes
No
[3]
Break output?
Yes
Clear PDR to 0 and
set PCR to 1
[1] Read SSR and check that the
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.
(After the TE bit is set to 1, one
frame of 1 is output, then
transmission is possible.)
[2] To continue serial transmission,
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.
[3] To output a break in serial
transmission, after setting PCR to 1
and PDR to 0, clear the TE bit in
SCR3 to 0.
Clear TE bit in SCR3 to 0
<End>
Figure 10.6 Sample Serial Transmission Flowchart (Asynchronous Mode)
Rev. 7.00 Mar. 08, 2010 Page 284 of 510
REJ09B0024-0700