Renesas 4513 Technical Information PDF herunterladen (Seite 53)

4513/4514 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

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.

Fig. 37 Voltage drop detection circuit operation waveform

Fig. 36 Voltage drop detection reset circuit

Voltage drop detection circuit

Internal reset signal

RESET pin

Watchdog timer output

WEF

Note: The output structure of RESET pin is N-channel open-drain.

RST

(detection voltage)

Voltage drop detection

circuit output

The microcomputer starts

operation after f(X

) is counted

16892 to 16895 times.

RESET pin

Notes 1: Pull-up RESET pin externally.

2: Refer to the voltage drop detection circuit in the electrical characteristics

for the rating value of V

RST

(detection voltage).

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Renesas 4513 Technical Information Seite 53