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| 型號： | C500 |
| 廠商： | SIEMENS AG |
| 元件分類： | 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） |
| 文件頁數(shù)： | 10/55頁 |
| 文件大?。?/td> | 495K |
| 代理商： | C500 |
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AP242401 04.99
Ceramic Resonator Oscillators of the
C500 / C166 Microcontroller Family
4
Fundamental Mode and 3rd Overtone Mode
The ceramic resonators recommended in the appendix are used in fundamental mode and 3rd
overtone mode. For detailed information have a look at the specification of the ceramic resonator.
As already mentioned a ceramic resonator needs no tank to run in 3rd overtone mode.
The standard external oscillator circuitry for fundamental mode or 3rd overtone mode, see figure
below, includes a ceramic resonator, two low end capacitors C
X1
and C
X2
, a feed back resistor R
f
to reduce gain and a series resistor R
X2
to vary gain and phase. The feed back resistor R
f
and the
series resistor R
X2
are not always used. The need depends on oscillator frequency, the type of
ceramic resonator, and on the application system.
A test resistor R
Q
may be
temporarily
inserted to measure the loop gain of the oscillator circuitry.
The principle how to check the start-up reliability will be explained in detail later.
Figure 2
Oscillator Circuitry for Fundamental Mode and 3rd Overtone Mode
Fundamental Mode or 3rd Overtone Mode:
XTAL1
(XTAL2)
XTAL2
(XTAL1)
to internal
clock circuitry
R
X2
R
Q
C
X1
C
X2
Q
(2 ... 40 MHz)
GND
R
f
R
fint
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