3886 datasheet(173/380 Pages) RENESAS

173 / 380 page

2-56

3886 Group User’s Manual

APPLICATION

2.4 Serial I/O

Figure 2.4.22 shows a control procedure of the transmitting side, and Figure 2.4.23 shows a control

procedure of the receiving side.

Fig. 2.4.22 Control procedure of transmitting side

RESET

Initialization

(Address : 1A16)

(Address : 1C16)

(Address : 3A16), bit0

SIO1CON

BRG

INTEDGE

8 – 1

TB/RB (Address : 1816)

The first byte of a

transmission data

• Transmission data write

Transmit buffer empty flag is set to “0”

by this writing.

• Detection of INT0 falling edge

IREQ1 (Address:3C16), bit0?

• Judgment of transferring from Transmit

buffer register to Transmit shift register

(Transmit buffer empty flag)

SIO1STS (Address : 1916), bit0?

TB/RB (Address : 1816)

• Transmission data write

Transmit buffer empty flag is set to “0”

by this writing.

The second byte of a

transmission data

• Judgment of transferring from Transmit

buffer register to Transmit shift register

(Transmit buffer empty flag)

SIO1STS (Address : 1916), bit0?

• Judgment of shift completion of Transmit shift register

(Transmit shift register shift completion flag)

SIO1STS (Address : 1916), bit2?

IREQ1 (Address : 3C16), bit0

1101xx002

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

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