HD64F3664FPV Datasheet, PDF (243/446 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
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.
[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 TxD in PMR1 to
0, then clear the TE bit in SCR3 to
0.
Clear TE bit in SCR3 to 0
<End>
Figure 14.6 Sample Serial Transmission Flowchart (Asynchronous Mode)
Rev. 6.00 Mar. 24, 2006 Page 213 of 412
REJ09B0142-0600