参数资料
型号: C166
厂商: SIEMENS AG
元件分类: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件页数: 10/45页
文件大小: 654K
代理商: C166
10 of 45
AP242005 07.99
Crystal Oscillators of the
C500 / C166 Microcontroller Family
4.2
Definition of the Oscillator Off Time t
off
Measurement of the oscillator start-up time is normally done periodically. After switching off power
supply, the oscillation continues until the whole reactive power oscillating between inductance and
capacitance is consumed. Therefore the time between switching off and on (t
off
) the power supply
must not be too short in order to get reproduceable results. t
off
depends on the composition of the
oscillator components.
It is recommended to use an oscillation off time t
off
0.5 sec for an oscillator frequency within the
range of 2 MHz
f
OSC
40 MHz, see figure 3.
The off time of a real time clock oscillator sholuld be at least t
off
60 sec.
Figure 3
Oscillator Off Time
V
DD
t
t
off
t
off
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