Section 16 Serial Communication Interface 3 (SCI3)
Start transmission
[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.
[1]
Read TDRE flag in SSR
No
TDRE = 1
Yes
[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.
Set MPBT bit in SSR
[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.
Write transmit data to TDR
Yes
[2]
All data transmitted?
No
Read TEND flag in SSR
No
No
TEND = 1
Yes
Break output?
Yes
[3]
Clear PDR to 0 and set PCR to 1
Clear TE bit in SCR3 to 0
<End>
Figure 16.16 Sample Multiprocessor Serial Transmission Flowchart
Rev. 3.00 Sep. 10, 2007 Page 320 of 528
REJ09B0216-0300
RENESAS [ RENESAS TECHNOLOGY CORP ]
