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參數(shù)資料
| 型號： | A8351601-40 |
| 廠商： | AMIC Technology Corporation |
| 英文描述： | Bar Code Reader |
| 中文描述： | 條碼閱讀器 |
| 文件頁數(shù)： | 33/44頁 |
| 文件大?。?/td> | 439K |
| 代理商： | A8351601-40 |
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A8351601 Series
(July, 2002, Version 1.0)
32
AMIC Technology, Inc.
Power-on Reset
An automatic reset can be obtained when
VCC
goes
through a 1
0μ
F 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 in Figure 15.
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
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.
VCC
GND
RST
VCC
10uF
+
A8351601
8.2K
Figure 15. Power-on Reset Circuit
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
12 OSC. PERIODS
ADDR
INST
ADDR
INST
ADDR
INST
ADDR
INST
ADDR
INST
11 OSC.
PERIODS
19 OSC.
PERIODS
SAMPLE
RST
SAMPLE
RST
INTERNAL RESET SIGNAL
Figure 16. Reset Timing
RST
ALE
PSEN
P0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A8351601F-40 | 制造商:AMICC 制造商全稱:AMIC Technology 功能描述:Bar Code Reader |
| A8351601L-40 | 制造商:AMICC 制造商全稱:AMIC Technology 功能描述:Bar Code Reader |
| A8351601SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Bar Code Reader |
| A83516-12 | 制造商:AMICC 制造商全稱:AMIC Technology 功能描述:8 Bit Microcontroller |
| A83516-24 | 制造商:AMICC 制造商全稱:AMIC Technology 功能描述:8 Bit Microcontroller |
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