參數(shù)資料
型號(hào): M34518M2-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP32
封裝: 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32
文件頁數(shù): 123/162頁
文件大?。?/td> 1149K
代理商: M34518M2-XXXFP
Rev.3.01
2005.06.15
page 61 of 157
REJ03B0008-0301
4518 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. 51 Voltage drop detection reset circuit
Fig. 52 Voltage drop detection circuit operation waveform
Table 17 Voltage drop detection circuit operation state
VDCE pin
“L”
“H”
At CPU operating
Invalid
Valid
At RAM back-up
Invalid
Valid
+
VRST
+
-
VDCE
Voltage drop detection circuit
Reset signal
Voltage drop detection circuit
VRST (reset release voltage)
+
-
VDD
Voltage drop detection circuit
Reset signal
Microcomupter starts operation after
on-chip oscillator (internal oscillator)
clock is counted 120 to 144 times.
VRST (reset voltage)
RESET pin
Note: Detection voltage hysteresis of voltage drop detection circuit is 0.2 V (Typ).
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