h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 496

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 13 Serial Communication Interface (SCI)
Figure 13.4 shows a sample SCI initialization flowchart.
Serial data transmission (asynchronous mode): Figure 13.5 shows a sample flowchart for serial
transmission.
The following procedure should be used for serial data transmission.
Rev. 5.00 Sep 22, 2005 page 470 of 1136
REJ09B0257-0500
Set CKE1 and CKE0 bits in SCR
SCR to 1, and set RIE, TIE, TEIE,
Clear TE and RE bits in SCR to 0
Set data transfer format in
<Transfer completion>
1-bit interval elapsed?
Set TE and RE bits in
SMR and SCMR
Set value in BRR
Start initialization
(TE, RE bits 0)
and MPIE bits
Figure 13.4 Sample SCI Initialization Flowchart
Yes
Wait
No
[1]
[2]
[3]
[4]
[1] Set the clock selection in SCR.
[2] Set the data transfer format in SMR
[3] Write a value corresponding to the
[4] Wait at least one bit interval, then
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.
and SCMR.
bit rate to BRR. Not necessary if an
external clock is used.
set the TE bit or RE bit in SCR to 1.
Also set the RIE, TIE, TEIE, and
MPIE bits.
Setting the TE and RE bits enables
the TxD and RxD pins to be used.