Renesas 4513 Manual De Usuario

1-52

4513/4514 Group User’s Manual

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.

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.

V

DD

V

RST

 (detection voltage)

Voltage drop detection 
circuit output

The microcomputer starts 
operation after f(X

IN

) 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).