SH7751 Datasheet, PDF (803/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

16. Serial Communication Interface with FIFO (SCIF)
Initialization
Clear TE and RE bits
in SCSCR2 to 0
Set TFRST and RFRST bits
in SCFCR2 to 1
Set CKE1 and CKE0 bits
in SCSCR2 (leaving TE
and RE bits cleared to 0)
Set data transfer format
in SCSMR2
Set value in SCBRR2
Wait
No
1-bit interval elapsed?
Yes
Set RTRG1–0, TTRG1–0,
and MCE bits in SCFCR2
Clear TFRST and RFRST bits to 0
Set TE and RE bits
in SCSCR2 to 1,
and set RIE, TIE, and REIE bits
1. Set the clock selection in SCSCR2.
Be sure to clear bits RIE and TIE,
and bits TE and RE, to 0.
2. Set the data transfer format in
SCSMR2.
3. Write a value corresponding to the
bit rate into SCBRR2. (Not
necessary if an external clock is
used.)
4. Wait at least one bit interval, then
set the TE bit or RE bit in SCSCR2
to 1. Also set the RIE, REIE, and
TIE bits.
Setting the TE and RE bits enables
the TxD2 and RxD2 pins to be
used. When transmitting, the SCIF
will go to the mark state; when
receiving, it will go to the idle state,
waiting for a start bit.
End
Figure 16.7 Sample SCIF Initialization Flowchart
Rev.4.00 Oct. 10, 2008 Page 705 of 1122
REJ09B0370-0400