參數(shù)資料
型號(hào)： M34501M4
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述： 單芯片4位微機(jī)的CMOS
文件頁(yè)數(shù)： 39/113頁(yè)
文件大小： 1252K
代理商： M34501M4
39
4501 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. 36 Voltage drop detection reset circuit
Fig. 37 Voltage drop detection circuit operation waveform
+
–
V
R
S
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V
D
D
Q
S
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Reset signal
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EPOF instruction +POF2 instruction
(continuousu execution)
(
Note 2
)
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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 V
DD
(supply voltage) is VRST (detection voltage) or less,
the voltage drop detection circuit reset signal is output.
V
DD
VRST
The microcomputer starts
operation after the ring
oscillator (internal oscillator) is
counted 5359 times.
(detection voltage)
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