HD64F3039F18 Datasheet, PDF (387/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 11 Serial Communication Interface
Start of initialization
Clear TE and RE bits
to 0 in SCR
Set CKE1 and CKE0 bits
in SCR (leaving TE and
1
RE bits cleared to 0)
Select communication
2
format in SMR
1. Select the clock source in SCR. Clear the RIE, TIE, TEIE,
MPIE, TE, and RE bits to 0. If clock output is selected in
asynchronous mode, clock output starts immediately after
the setting is made in SCR.
2. Select the communication format in SMR.
3. Write the value corresponding to the bit rate in BRR.
This step is not necessary when an external clock is used.
4. Wait for at least the interval required to transmit or receive
1 bit, then set the TE or RE bit to 1 in SCR. Set the RIE,
TIE, TEIE, and MPIE bits as necessary. Setting the TE
or RE bit enables the SCI to use the TxD or RxD pin.
Set value in BRR
3
Wait
1 bit interval
No
elapsed?
Yes
Set TE or RE bit to 1 in SCR
Set RIE, TIE, TEIE, and 4
MPIE bits as necessary
Transmitting or receiving
Figure 11.4 Sample Flowchart for SCI Initialization
Rev.3.00 Mar. 26, 2007 Page 363 of 682
REJ09B0353-0300