參數(shù)資料
型號: M34502M2-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, MICROCONTROLLER, PDSO24
封裝: 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁數(shù): 50/116頁
文件大?。?/td> 896K
代理商: M34502M2-XXXFP
4502 Group
Rev.3.01
2005.02.02
page 39 of 112
REJ03B0105-0301
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.
Note 3
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.
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