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| 型號(hào)： | IS80LV52-40W |
| 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 LOW VOLTAGE 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-40 |
| 文件頁數(shù)： | 34/48頁 |
| 文件大?。?/td> | 408K |
| 代理商： | IS80LV52-40W |
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IS80LV52
IS80LV32
34
Integrated Silicon Solution, Inc. — 1-800-379-4774
ADVANCE INFORMATION
MC019-0A
10/01/98
ISSI
Power-on Reset
An automatic reset can be obtained when V
CC
goes
through a 10
μ
F capacitor and GND through an 8.2K
resistor, providing the V
CC
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 in 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
IS80LV52/32
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
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|---|---|
| IS80LV52-40WI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
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