參數(shù)資料
型號(hào): M34501E4FP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, MICROCONTROLLER, PDSO20
封裝: 5.30 X 12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件頁數(shù): 52/116頁
文件大?。?/td> 859K
代理商: M34501E4FP
Rev.3.01
2005.02.07
page 40 of 112
REJ03B0104-0301
4501 Group
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
Fig. 38 Voltage drop detection circuit operation waveform example
+
VRST
VDD
Q
S
R
Reset signal
Return input
EPOF instruction +POF2 instruction
(continuous execution)
(Note 2)
Voltage drop detection circuit
reset signal
(Note 1)
Voltage drop detection circuit
Notes 1: In the RAM back-up mode by the POF2 instruction,
the voltage drop detection circuit stops.
2: When the VDD (supply voltage) is VRST (detection voltage) or less,
the voltage drop detection circuit reset signal is output.
VDD
The microcomputer starts
operation after the on-chip
oscillator (internal oscillator)
is counted 5359 times.
VRST
(detection voltage)
Voltage drop detection
circuit reset signal
RESET pin
Notes 1: After system is released from reset, the on-chip oscillator (internal oscillator)
is selected as the operation clock of the microcomputer.
2: Refer to the voltage drop detection circuit characteristics in the electrical characteristics
for the rating value of VRST (detection voltage).
3: The VRST (detection voltage) does not include hysteresis.
Note 3
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