HD6473032F16 Datasheet, PDF (497/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 13 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
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
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.
Transmitting or receiving
Figure 13.4 Sample Flowchart for SCI Initialization
Rev. 3.00 Mar 21, 2006 page 467 of 814
REJ09B0302-0300