HD64F2149 Datasheet, PDF (494/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Start initialization
Clear TE and RE bits in SCR to 0
[1] Set the clock selection in SCR. Be sure
to clear bits RIE, TIE, TEIE, and MPIE,
TE and RE, to 0.
[2] Set the data transfer format in SMR
and SCMR.
Set CKE1 and CKE0 bits in SCR
(TE, RE bits 0)
Set data transfer format in
SMR and SCMR
Set value in BRR
Wait
1-bit interval elapsed?
[1] _{[3] Write a value corresponding to the bit}
rate to BRR. This is not necessary if an
external clock is used.
[2] _{[4] Wait at least one bit interval, then set}
the TE bit or RE bit in SCR to 1.
[3]
Also set the RIE, TIE, TEIE, and MPIE
bits.
Setting the TE and RE bits enables the
TxD and RxD pins to be used.
No
Yes
Set TE and RE bits in SCR to 1, and _[4]
set RIE, TIE, TEIE, and MPIE bits
<Transfer start>
Note: In simultaneous transmit and receive operations, the TE bit and RE bit should both be cleared
to 0 or set to 1 simultaneously.
Figure 15.15 Sample SCI Initialization Flowchart
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