Voltage Drop Detection Circuit; Fig. 36 Voltage Drop Detection Reset Circuit; Fig. 37 Voltage Drop Detection Circuit Operation Waveform - Renesas 4513 User Manual

HARDWARE
FUNCTION BLOCK OPERATIONS

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.
RESET pin

Fig. 36 Voltage drop detection reset circuit

V
V (detection voltage)
RST
Voltage drop detection
circuit output
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

Fig. 37 Voltage drop detection circuit operation waveform

1-52
Note: The output structure of RESET pin is N-channel open-drain.
DD
(detection voltage).
RST
4513/4514 Group User's Manual
Voltage drop detection circuit
Watchdog timer output
WEF
Internal reset signal
The microcomputer starts
operation after f(X ) is counted
IN
16892 to 16895 times.