參數(shù)資料
型號(hào)： IS89C52-24PLI
廠商： INTEGRATED SILICON SOLUTION INC
元件分類(lèi)： 微控制器/微處理器
英文描述： CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
中文描述： 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 34/50頁(yè)
文件大?。?/td> 425K
代理商： IS89C52-24PLI
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
IS89C52-24PQ CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-24PQI CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-24W CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-24WI CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-40PL CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IS89C52-24PQ 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-24PQI 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-24W 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-24WI 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
IS89C52-40PL 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
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