4282 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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4282

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

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

MITSUBISHI MICROCOMPUTERS

4282 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

XI N

XOUT

OSC

POF instruction

R

Q

S

CCK instruction

Frequency

divider

(divided by 8)

Multi-

plexer

Internal clock

generation circuit

(divided by 4)

STCK

Internal power-on reset circuit

INSTCK

Pull-down control

register PU0

Pull-down control

register 1

Ports E0,E1,G0–G3

Ports D4–D7

Port E2

Fig. 25 Clock control circuit structure

System 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*

(2) Mark Specification Form

(3) Data to be written to ROM, in EPROM form (three identical

copies) or one floppy disk.

XIN

4

CIN

4282

XOUT

5

Use the resonator

manufacturer’s

recommended value

because constants

such as capacitance

depend on the

resonator.

COUT

* For the mask ROM confirmation, refer to the “Mitsubishi MCU

Technical Information” Homepage (http://

www.infomicom.maec.co.jp/indexe.htm).

Fig. 26 Ceramic resonator external circuit

MITSUBISHI

ELECTRIC

21

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