Renesas H8S/2318 series, Hardware Manual

Page: 484 / 1121

Rev. 5.00, 12/03, page 454 of 1088
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 settings 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 interval, 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