7643 datasheet(148/424 Pages) RENESAS

148 / 424 page

Rev.2.00

Aug 28, 2006

page 27 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.3 Serial I/O

2.3.3 Serial I/O connection examples

(1) Control of peripheral IC equipped with CS pin

Figure 2.3.7 shows connection examples of a peripheral IC equipped with the CS pin.

Fig. 2.3.7 Serial I/O connection examples (1)

Port

SCLK

STXD

SRXD

Port

CLK

OUT

CLK

OUT

(4) Connection of plural IC

7643 group

Peripheral IC 1

Peripheral IC 2

Port

SCLK

STXD

SRXD

CLK

OUT

(2) Transmission and reception

7643 group

Peripheral IC

(E PROM etc.)

(3) Transmission and reception

(When connecting SRXD with STXD)

(When connecting IN with OUT in

peripheral IC)

CLK

OUT

7643 group

Peripheral IC

(E PROM etc.)

✽2

Notes : “Port” means an output port controlled by software.

Port

SCLK

STXD

CLK

DATA

(1) Only transmission

(Using the SRXD pin as an I/O port)

7643 group

Peripheral IC

(OSD controller etc.)

✽1

✽

1: Select an N-channel open-drain output for STXD pin output control.

✽

2: Use the OUT pin of peripheral IC which is an N-channel open-

drain output and becomes high impedance during receiving data.

Port

SCLK

STXD

SRXD

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