參數(shù)資料
型號： IS89LV51
英文描述： CMOS Single Chip Low Voltage 8-Bit Microcontroller
中文描述： CMOS單芯片低電壓8位微控制器
文件頁數(shù)： 32/48頁
文件大小： 776K
代理商： IS89LV51
IS89LV51
32
1-800-379-4774 — Integrated Silicon Solution, Inc.
ADVANCE INFORMATION
MC020-0A
10/27/98
ISSI
Power-on Reset
For the IS89LV51, 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 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 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 19. Power-On Reset Circuit
Vcc
RST
GND
Vcc
IS89LV51
1.0
μ
F
+
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