參數(shù)資料
型號: P83C524
廠商: NXP Semiconductors N.V.
英文描述: 8-bit microcontrollers
中文描述: 8位微控制器
文件頁數(shù): 45/76頁
文件大?。?/td> 400K
代理商: P83C524
1997 Dec 15
45
Philips Semiconductors
Product specification
8-bit microcontrollers
P83C524; P80C528; P83C528
17.1
Power-on reset
When V
DD
is turned on, and provided its rise-time does not
exceed 10 ms, an automatic reset can be obtained by
connecting the RST pin to V
DD
via a 2.2
μ
F capacitor.
When the power is switched on, the voltage on the RST pin
is equal to V
DD
minus the capacitor voltage, and
decreases from V
DD
as the capacitor charges through the
internal resistor (R
RST
) to ground. The larger the capacitor,
the more slowly V
RST
decreases. V
RST
must remain above
the lower threshold of the Schmitt trigger long enough to
effect a complete reset. The time required is the oscillator
start-up time, plus 2 machine cycles, or 16 x 2048 cycles
of the on-chip watchdog oscillator if it is running, whichever
is longer (see Fig.25).
Fig.25 Power-on reset.
handbook, halfpage
DD
RST
2.2
μ
F
RRST
MBC474
P83C528
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