HD64F3437TF16 Datasheet, PDF (292/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

Initialization
Clear TE and RE bits to
0 in SCR
Set CKE1 and CKE0 bits in
1 SCR (leaving TE and RE
cleared to 0)
2
Select communication
format in SMR
3
Set value in BRR
1 bit interval
No
elapsed?
Yes
4 Set TE or RE to 1 in SCR,
and set RIE, TIE, TEIE, and
MPIE as necessary
1. Select interrupts and the clock source in the
serial control register (SCR). Leave TE and RE
cleared 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 the serial
mode register (SMR).
3. Write the value corresponding to the bit rate in
the bit rate register (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 TE or RE in the serial
control register (SCR). Setting TE or RE enables
the SCI to use the TxD or RxD pin.
Also set the RIE, TIE, TEIE, and MPIE bits as
necessary to enable interrupts. The initial states
are the mark transmit state, and the idle receive
state (waiting for a start bit).
Start transmitting or receiving
Figure 12.4 Sample Flowchart for SCI Initialization
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