4280 datasheet(21/48 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

4280 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS

Fig. 24 Clock control circuit structure

Clock signal f(XIN) is obtained by externally connecting a ceramic

resonator. Connect this external circuit to pins XIN and XOUT at

the shortest distance as shown Figure 26.

A feedback resistor is built-in between XIN pin and XOUT pin.

ROM ORDERING METHOD

Please submit the information described below when ordering

Mask ROM.

(1) Mask ROM Order Confirmation Form................................. 1

(2) Data to be written into mask ROM .......................... EPROM

(three sets containing the identical data)

(3) Mark Specification Form .................................................... 1

Fig. 25 Ceramic resonator external circuit

CLOCK CONTROL

The clock control circuit consists of the following circuits.

• System clock generating circuit

• Control circuit to stop the clock oscillation

• Control circuit to return from the RAM back-up state

OSC

POF instruction

XIN

XOUT

CCK instruction

STCK

INSTCK

Frequency

divider

(divided by 8)

Multi-

plexer

Internal clock

generating circuit

(divided by 4)

Internal power-on reset circuit

Pull-down control

Port D7

Ports E0, E1

Ports E2, G0–G3

4280

XIN

XOUT

CIN

COUT

Use the resonator

manufacturer’s

recommended value

because constants

such as capacitance

depend on the

resonator.

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