Datasheet

Section 12 Serial Communication Interface (SCI)
Rev.7.00 Feb. 14, 2007 page 465 of 1108
REJ09B0089-0700
Figure 12.4 shows a sample SCI initialization flowchart.
Wait
<Initialization completed>
Start of initialization
Set data transfer format in
SMR and SCMR
[1]
Set CKE1 and CKE0 bits in SCR
(TE, RE bits 0)
No
Yes
Set value in BRR
Clear TE and RE bits in SCR to 0
[2]
[3]
Set TE or RE bit in
SCR to 1, and set RIE, TIE, TEIE,
and MPIE bits as necessary
[4]
1-bit interval elapsed?
[1] Set the clock selection in SCR.
Be sure to clear bits RIE, TIE,
TEIE, and MPIE, and bits TE and
RE, to 0.
When the clock is selected in
asynchronous mode, it is output
immediately after SCR setti
ngs are
made.
[2] Set the data transfer format in SMR
and SCMR.
[3] Write a value corresponding to the
bit rate to BRR (Not necessary if
an external clock is used).
[4] Wait at least one bit interva
l, then
set the TE bit or RE bit in SCR to 1.
Also set the RIE, TIE, TEIE, and
MPIE bits as necessary.
Setting the TE or RE bit enables
the TxD or RxD pin to be used.
Figure 12.4 Sample SCI Initialization Flowchart