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參數(shù)資料
| 型號(hào)： | IS80C31-40PQ |
| 廠商： | INTEGRATED SILICON SOLUTION INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, 40 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 30/43頁 |
| 文件大小： | 337K |
| 代理商： | IS80C31-40PQ |
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IS80C51
IS80C31
30
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC003-1D
11/19/98
ISSI
Power-on Reset
An automatic reset can be obtained when V
CC
goes
through a 10
μ
F capacitor and GND through an 8.2K
resistor, providing the V
CC
rise time does not exceed 1 msec
and the oscillator start-up time does not exceed 10 msec.
For the IS80C51/31, the external resistor can be removed
because the RST pin has an internal pulldown.
The capicator value can then be reduced to 1
μ
F (see
Figure 19).
When power is turned on, the circuit holds the RST pin high
for an amount of time that depends on the value of the
capacitor and the rate at which it charges. To ensure a
good reset, the RST pin must be high long enough to allow
the oscillator time to start-up (normally a few msec) plus
two machine cycles.
Note that the port pins will be in a random state until the
oscillator has start and the internal reset algorithm has
written 1s to them.
With this circuit, reducing V
CC
quickly to 0 causes the RST
pin voltage to momentarily fall below 0V. However, this
voltage is internally limited, and will not harm the device.
Figure 19. Power-On Reset Circuit
Vcc
RST
GND
Vcc
IS80C51/31
1.0
μ
F
+
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PDF描述 |
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| IS80C31-40PQI | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IS80C31-40W | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IS80C31-40WI | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IS80C51 | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IS80C51-12PL | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IS80C31-40PQI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IS80C31-40W | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IS80C31-40WI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IS80C31-L16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| IS80C32 | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
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