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參數(shù)資料
| 型號： | IC80C32-24PQ |
| 英文描述： | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| 中文描述： | CMOS單芯片8位微控制器 |
| 文件頁數(shù)： | 34/48頁 |
| 文件大?。?/td> | 274K |
| 代理商： | IC80C32-24PQ |
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IC80C52
IC80C32
34
Integrated Circuit Solution Inc.
MC002-0B
Power-on Reset
An automatic reset can be obtained when V
CC
goes through
a 10μF capacitor and GND through an 8.2K resistor,
providing the Vcc rise time does not exceed 1 msec and the
oscillator start-up time does not exceed 10 msec. This
Power-on reset circuit is shown if Figure 21. The CMOS
devices do not require the 8.2K pulldown resistor, although
its presence does no harm.
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 21. Power-On Reset Circuit
Vcc
RST
GND
Vcc
IC80C52/32
10 F
8.2K
+
-
Figure 22. Reset Timing
12 OSC. PERIODS
ALE
RST
SAMPLE
RST
SAMPLE
RST
INTERNAL RESET SIGNAL
PSEN
P0
11 OSC. PERIODS
INST
ADDR
INST
INST
INST
19 OSC. PERIODS
S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4
ADDR
ADDR
ADDR
INST
ADDR
相關PDF資料 |
PDF描述 |
|---|---|
| IC80C32-24W | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-40PL | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-40PQ | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-40W | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C52-12PL | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| IC80C32-24W | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-40PL | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-40PQ | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-40W | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C51 | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
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