M34570EDFP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M34570EDFP

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4570 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

VOLTAGE DROP DETECTION CIRCUIT

The built-in voltage drop detection circuit is designed to detect a

drop in voltage and to reset the microcomputer if the supply

voltage drops below a set value.

The voltage drop detection circuit is not operated at the RAM

back-up mode.

Pull-up transistor

RESET pin

Power-on

reset circuit

Internal reset signal

Voltage drop detection circuit

Watchdog timer output

WEF

Fig. 27 Voltage drop detection reset circuit

VDD

Reset voltage

Internal reset

signal

The microcomputer starts operation

after the f(XIN) is counted 10757 to

10786 times.

Note: Set the VDCE pin to “H” level to operate the

voltage drop detection circuit.

Fig. 28 Voltage drop detection circuit operation waveform

30

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