3069RF-ZTAT Datasheet, PDF (523/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Figure 13.15 shows a sample flowchart for initializing the SCI.
Start of initialization
Clear TE and RE bits to 0 in SCR
Set RIE, TIE, TEIE, MPIE, CKE1,
and CKE0 bits in SCR (leaving ⁽¹⁾
TE and RE bits cleared to 0)
Select communication format ₍₂₎
in SMR
Set value in BRR
Wait
1-bit interval elapsed?
(3)
No
Yes
Set TE or RE bit to 1 in SCR
Set RIE, TIE, TEIE, and MPIE ⁽⁴⁾
bits as necessary
(1) Set 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.* 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.
Note: * In simultaneous transmitting and receiving,
the TE and RE bits should be cleared to 0 or
set to 1 simultaneously.
<Start transmitting or receiving>
Figure 13.15 Sample Flowchart for SCI Initialization
Rev. 5.0, 09/04, page 501 of 978