7477 datasheet(265/354 Pages) RENESAS

Part #	7477

Description	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES

PDF	354 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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7470/7471/7477/7478 GROUP USER’S MANUAL

2-30

APPLICATION

2.4 Serial I/O

7470

7471

7477

7478

××

2.4.4 Application examples

(1) Clock synchronous serial I/O mode

Outline: Clock synchronous communication is performed among the 7477/7478 group.

Specifications: M3747x

1……Transmit side in half-duplex communication.

• Synchronous clock: BRG output (f(XIN)/4 or f(XIN)/16)/4.

_________

• Port P17 is used as an SRDY signal input pin.

M3747x

2……Receive side in half-duplex communication

• Synchronous clock: External clock

_________

• SRDY signal output

Figure 2.4.8 shows an example of connections and Figure 2.4.9 shows an example of control

procedure.

Fig. 2.4.8 Example of connections [Clock synchronous serial I/O mode, 7477/7478 group]

P17

SCLK

SRDY

RxD

SCLK

TxD

RxD

TxD

M3747x

Use

→ Full-duplex communication

No use

→ Half-duplex communication

7477 Datasheet(PDF) 265 Page - Renesas Technology Corp