HD64F3694HV Datasheet, PDF (253/452 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 14 Serial Communication Interface 3 (SCI3)
Start transmission
[1]
Read TDRE flag in SSR
No
TDRE = 1
Yes
Set MPBT bit in SSR
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, set the MPBT bit in
SSR to 0 or 1, then write transmit
data to TDR. When data is written to
TDR, the TDRE flag is automatically
cleared to 0.
[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. When data is
written to TDR, the TDRE flag is
automatically cleared to 0.
[3] To output a break in serial
transmission, set the port PCR to 1,
clear PDR to 0, then clear the TE bit
in SCR3 to 0.
Clear TE bit in SCR3 to 0
<End>
Figure 14.16 Sample Multiprocessor Serial Transmission Flowchart
Rev.5.00 Nov. 02, 2005 Page 223 of 418
REJ09B0028-0500