D12320VF25IV Datasheet, PDF (681/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 14 Serial Communication Interface (SCI)
Start of initialization
[1] Set the clock selection in SCR. Be sure
to clear bits RIE, TIE, TEIE, and MPIE,
Clear TE and RE bits in SCR to 0
TE and RE, to 0.
[2] Set the data transfer format in SMR
and SCMR.
Set CKE1 and CKE0 bits in SCR
(TE, RE bits 0)
[1] _{[3] Write a value corresponding to the bit}
rate to BRR. (Not necessary if an
Set data transfer format in
SMR and SCMR
external clock is used.)
[2]
[4] Wait at least one bit interval, then set
the TE bit or RE bit in SCR to 1.
Set value in BRR
[3]
Also set the RIE, TIE, TEIE, and MPIE
bits as necessary.
Wait
Setting the TE or RE bit enables the
TxD or RxD pin to be used.
No
1-bit interval elapsed?
Yes
Set TE or RE bit in SCR to 1, and
set RIE, TIE, TEIE, and MPIE bits ^[4]
as necessary
<Transfer start>
Note: In simultaneous transmit and receive operations, the TE and RE bits should
both be cleared to 0 or set to 1 simultaneously.
Figure 14.15 Sample SCI Initialization Flowchart
Rev.6.00 Sep. 27, 2007 Page 649 of 1268
REJ09B0220-0600