參數(shù)資料
型號(hào)： IS89C51-40PQ
廠商： INTEGRATED SILICON SOLUTION INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44
封裝： PLASTIC, QFP-44
文件頁(yè)數(shù)： 26/48頁(yè)
文件大?。?/td> 371K
代理商： IS89C51-40PQ
IS89C51
32
1-800-379-4774 — Integrated Silicon Solution, Inc.
MC016-1C
11/21/98
ISSI
Power-on Reset
For the IS89C51, the external resistor can be removed
because the RST pin has an internal pulldown.
The capacitor value can then be reduced to 1
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 VCC 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
IS89C51
1.0
F
+
相關(guān)PDF資料
PDF描述
IS89LV51-12PQ 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP44
IS89LV51-24WI 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP40
IS89LV51-40W 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40
IS89LV52-12W 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PDIP40
IS89LV52-40PQI 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IS89C51-40PQI 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
IS89C51-40W 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 4-Kbytes of FLASH
IS89C51-40WI 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
IS89C52 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
IS89C52-12PL 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
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