M38047FEHKP datasheet(203/387 Pages) RENESAS

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2-79

APPLICATION

2.4 Serial interface

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

Figure 2.4.42 shows a control procedure of the transmitting side, and Figure 2.4.43 shows a control

procedure of the receiving side.

Fig. 2.4.42 Control procedure of transmitting side

SIO1STS (Address : 001916), bit0?

RESET

• Communication completion

(Address : 001A16)

(Address : 001B16)

(Address : 001C16)

(Address : 000816), bit0

(Address : 000916)

P4 (Address : 000816), bit0

Pass 10 ms?

TB1/RB1

(Address : 001816)

The second byte of

a transmission data

SIO1STS (Address : 001916), bit2?

Initialization

SIO1CON

UART1CON

BRG1

P4D

1001X0012

000010002

8–1

TB1/RB1

(Address : 001816)

The first byte of a

transmission data

P4 (Address : 000816), bit0

• Port P40 set for communication control

• An interval of 10 ms generated by Timer

• Communication start

• Transmission data write

Transmit buffer empty flag is set to “0”

by this writing.

• Transmission data write

Transmit buffer empty flag is set to “0”

by this writing.

• Judgment of transferring data from Transmit

buffer register to Transmit shift register

(Transmit buffer empty flag)

• Judgment of transferring data from Transmit

buffer register to Transmit shift register

(Transmit buffer empty flag)

• Judgment of shift completion of Transmit shift register

(Transmit shift register shift completion flag)

SIO1STS (Address : 001916), bit0?

XXXXXXX12

q X: This bit is not used here. Set it to “0” or “1” arbitrarily.

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