HD6433644R datasheet(336/549 Pages) RENESAS

336 / 549 page

Section 10 Serial Communication Interface

Rev. 6.00 Sep 12, 2006 page 316 of 526

REJ09B0326-0600

Figure 10.10 shows an example of a flowchart for initializing SCI3.

Start

End

Clear bits TE and

RE to 0 in SCR3

Set bits CKE1

and CKE0

Set data transfer

format in SMR

Set value in BRR

Wait

Yes

Has 1-bit period

elapsed?

Set clock selection in SCR3. Be sure to

clear the other bits to 0. If clock output

is selected in asynchronous mode, the

clock is output immediately after setting

bits CKE1 and CKE0. If clock output is

selected for reception in synchronous

mode, the clock is output immediately

after bits CKE1, CKE0, and RE are

set to 1.

Set the data transfer format in the serial

mode register (SMR).

Write the value corresponding to the

transfer rate in BRR. This operation is

not necessary when an external clock

is selected.

4. Wait for at least the interval required to

transmit or receive one bit, then set TE or

RE in the serial control register (SCR3).

Setting RE enables the RxD pin to be

used,

and when transmitting, setting bit TXD in

PMR7 enables the TXD output pin to be

used.

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).

Set bit TE or RE to

1 in SCR3, set bits

RIE, TIE, TEIE, and

MPIE as necessary,

and when transmitting

(TE = 1), set bit TXD

to 1 in PMR7

Figure 10.10 Example of SCI3 Initialization Flowchart

HD6433644R Datasheet(PDF) 336 Page - Renesas Technology Corp

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