HD64F3048F16 Datasheet, PDF (529/903 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 13 Serial Communication Interface
Start of initialization
Clear TE and RE
bits to 0 in SCR
Set RIE, TIE, TEIE, MPIE,
CKE1, and CKE0 bits in SCR
1
(leaving TE and RE bits
cleared to 0)
2
Select communication
format in SMR
3
Set value in BRR
Wait
1 bit interval
No
elapsed?
Yes
Set TE or RE 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.
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. Also 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.
Start transmitting or receiving
Note: In simultaneous transmitting and receiving, the TE and
RE bits should be cleared to 0 or set to 1 simultaneously.
Figure 13.15 Sample Flowchart for SCI Initialization
Rev. 3.00 Sep 27, 2006 page 501 of 872
REJ09B0325-0300