參數(shù)資料
型號: M34554MC-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP64
封裝: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64
文件頁數(shù): 88/137頁
文件大?。?/td> 1606K
代理商: M34554MC-XXXFP
54
4554 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. 41 Voltage drop detection reset circuit
Fig. 42 Voltage drop detection circuit operation waveform
Table 14 Voltage drop detection circuit operation state
VDCE pin
“L”
“H”
At CPU operating
Invalid
Valid
At power down
(SVDE instruction is not executed)
Invalid
At power down
(SVDE instruction is executed)
Invalid
Valid
EPOF instruction +POF instruction
EPOF instruction +POF2 instruction
Q
S
R
SVDE instruction
Internal reset signal
Voltage drop detection circuit
Reset signal
VRST
Voltage drop detection circuit
VDCE
Internal reset signal
T5F flag
Key-on wakeup signal
Q
S
R
+
VDD
Voltage drop detection circuit
Reset signal
Microcomupter starts operation after
ring oscillator (internal oscillator)
clock is counted 5400 to 5424 times.
VRST (detection
voltage)
RESET pin
Note: Detection voltage of voltage drop detection circuit does not have hysteresis.
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