SH7641 Datasheet, PDF (786/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

Section 19 Serial Communication Interface with FIFO (SCIF)
• Transmitting Serial Data (Synchronous Mode)
Figure 19.13 shows a sample flowchart for transmitting serial data.
Use the following procedure for serial data transmission after enabling the SCIF for transmission.
Start of transmission
Read TDFE flag in SCFSR
[1]
No
TDFE = 1?
Yes
Write transmit data to SCFTDR
and clear TDFE flag
in SCFSR to 0
All data transmitted?
Yes
No
[2]
Read TEND flag in SCFSR
No
TEND = 1?
Yes
Clear TE bit in SCSCR to 0
[1] SCIF status check and transmit data
write:
Read SCFSR and check that the
TDFE flag is set to 1, then write
transmit data to SCFTDR, and clear
the TDFE flag to 0. The transition of
the TDFE flag from 0 to 1 can also be
identified by a TXI interrupt.
[2] Serial transmission continuation
procedeure:
To continue serial transmission, read
1 from the TDFE flag to confirm that
writing is possible, them write data to
SCFTDR, and then clear the TDFE
flag to 0.
End of transmission
Figure 19.13 Sample Flowchart for Transmitting Serial Data
Rev. 4.00 Sep. 14, 2005 Page 736 of 982
REJ09B0023-0400