Section 16 Serial Communication Interface 3 (SCI3)
Start transmission
[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.
[1]
Read TDRE flag in SSR
[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.
No
TDRE = 1
Yes
Write transmit data to TDR
[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.
Yes
[2]
All data transmitted?
No
Read TEND flag in SSR
No
No
TEND = 1
Yes
[3]
Break output?
Yes
Clear PDR to 0 and
set PCR to 1
Clear TE bit in SCR3 to 0
<End>
Figure 16.6 Sample Serial Transmission Data Flowchart (Asynchronous Mode)
Rev. 3.00 Sep. 10, 2007 Page 306 of 528
REJ09B0216-0300
RENESAS [ RENESAS TECHNOLOGY CORP ]
