HD6413007F20 Datasheet, PDF (490/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

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 RE bits
(1)
cleared to 0)
Select communication format ₍₂₎
in SMR
Set value in BRR
(3)
Wait
No
1-bit interval elapsed?
Yes
Set TE or RE bit to 1 in SCR (4)
Set RIE, TIE, TEIE, and MPIE bits
(1) Set 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 one bit, then set the
TE or RE bit to 1 in SCR. Set the RIE,
TIE, TEIE, and MPIE bits. Setting the TE
or RE bit enables the SCI to use the TxD
or RxD pin.
<End of initialization>
Note: In simultaneous transmitting and receiving, the TE and RE bits should be cleared to 0 or
set to 1 simultaneously.
Figure 13.4 Sample Flowchart for SCI Initialization
Rev.5.00 Sep. 12, 2007 Page 460 of 764
REJ09B0396-0500