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參數(shù)資料
| 型號： | IS89C52-40WI |
| 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 with 8-Kbytes of FLASH |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-40 |
| 文件頁數(shù)： | 34/50頁 |
| 文件大?。?/td> | 425K |
| 代理商： | IS89C52-40WI |
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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 |
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| IS89C52-12PL | RY Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 24V; Output Voltage (Vdc): 05V; Power: 1W; On/Off Pin; 1kVDC Isolation; UL94V-0 Package Material; Optional Continuous Short Circuit Protected; Internal linear regulator; Efficiency to 70% |
| IS89C52-12PLI | ECONOLINE: RY-S_DCP - Internal SMD Technology- 1kVDC Isolation- Short Circuit Protection: Current Limit- UL94V-0 Package Material- Regulated Output- No External Components Required- Efficiency to 63% |
| IS89C52-12PQ | RY Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 24V; Output Voltage (Vdc): 05V; Power: 1W; On/Off Pin; 1kVDC Isolation; UL94V-0 Package Material; Optional Continuous Short Circuit Protected; Internal linear regulator; Efficiency to 70% |
| IS89C52 | CMOS Single Chip 8-Bit Microcontroller with 8-Kbytes of Flash(帶8K字節(jié)閃速存儲器的CMOS單片8位微控制器) |
| IS89C52-12PQI | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
相關(guān)代理商/技術(shù)參數(shù) |
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| IS89D | 制造商:IDEC CORPORATION 功能描述:SENS.IND. 2W/F 24-23VAC NO |
| IS89DK | 制造商:IDEC CORPORATION 功能描述:SENS.IND. 2W/F 24-230VAC NO |
| IS89DL | 制造商:IDEC CORPORATION 功能描述:SENS.IND. 2W/F 24-230VAC NO |
| IS89K | 制造商:IDEC CORPORATION 功能描述:SENS.IND. 2W/F 24-230AC NO |
| IS89L | 制造商:IDEC CORPORATION 功能描述:SENS.IND. 2W/F 24-230AC NO |
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