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參數(shù)資料
| 型號(hào)： | IS89C52 |
| 廠商： | Integrated Silicon Solution, Inc. |
| 英文描述： | CMOS Single Chip 8-Bit Microcontroller with 8-Kbytes of Flash(帶8K字節(jié)閃速存儲(chǔ)器的CMOS單片8位微控制器) |
| 中文描述： | CMOS單芯片8位微控制器與8的快閃記憶體（帶8K的字節(jié)閃速存儲(chǔ)器的的CMOS單片8位微控制器） |
| 文件頁數(shù)： | 34/50頁 |
| 文件大?。?/td> | 425K |
| 代理商： | IS89C52 |
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IS89C52
34
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC013-1C
11/21/98
ISSI
Power-on Reset
For the IS89C52, the external resistor can be removed
because the RST pin has an internal pulldown.
The capacitor value can then be reduced to 1
μ
F (see
Figure 22).
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 22. Power-On Reset Circuit
Vcc
RST
GND
Vcc
IS89C52
1.0
μ
F
+
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IS89C52-12PQI | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12W | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS93C46-3 | 1,024-BIT SERIAL ELECTRICALLY ERASABLE PROM |
| IS93C46-3G | 1,024-BIT SERIAL ELECTRICALLY ERASABLE PROM |
| IS93C46-3GI | 1,024-BIT SERIAL ELECTRICALLY ERASABLE PROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IS89C52-12PL | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12PLI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12PQ | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12PQI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12W | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
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