HD64F3664FPV Datasheet, PDF (250/446 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 14 Serial Communication Interface 3 (SCI3)
Start transmission
[1]
Read TDRE flag in SSR
No
TDRE = 1
Yes
Write transmit data to TDR
[2]
All data transmitted?
Yes
No
[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 automatically cleared
to 0 and clocks are output to start the
data transmission.
[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
Read TEND flag in SSR
No
TEND = 1
Yes
Clear TE bit in SCR3 to 0
<End>
Figure 14.11 Sample Serial Transmission Flowchart (Clocked Synchronous Mode)
Rev. 6.00 Mar. 24, 2006 Page 220 of 412
REJ09B0142-0600