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參數(shù)資料
| 型號(hào)： | M34554EDFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64 |
| 文件頁(yè)數(shù)： | 89/138頁(yè) |
| 文件大?。?/td> | 1082K |
| 代理商： | M34554EDFP |
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Rev.3.00
Aug 06, 2004
page 54 of 136
REJ03B0043-0300Z
4554 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. 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
on-chip 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.
(2) Note on voltage drop detection circuit
The voltage drop detection circuit detection voltage of this prod-
uct is set up lower than the minimum value of the supply voltage
of the recommended operating conditions.
When the supply voltage of a microcomputer falls below to the
minimum value of recommended operating conditions and re-
goes up (ex. battery exchange of an application product),
depending on the capacity value of the bypass capacitor added
to the power supply pin, the following case may cause program
failure (Figure 43);
supply voltage does not fall below to VRST, and
its voltage re-goes up with no reset.
In such a case, please design a system which supply voltage is
once reduced below to VRST and re-goes up after that.
Fig. 43 VDD and VRST
VDD
Recommended
operatng condition
min.value
No reset
Program failure may occur.
VRST
VDD
Recommended
operatng condition
min.value
VRST
→ Normal operation
Reset
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M34554M8-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34554MC-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556G8FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556G8HFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556M4H-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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