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參數(shù)資料
| 型號： | EM78P451SWM |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 8-Bit Microcontroller with OTP ROM |
| 中文描述： | 8位微控制器的OTP ROM的 |
| 文件頁數(shù)： | 44/54頁 |
| 文件大?。?/td> | 421K |
| 代理商： | EM78P451SWM |
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EM78P451S
8-Bit Microcontroller with OTP ROM
4.9.3 RC Oscillator Mode
40
Product Specification (V1.0) 06.01.2004
(This specification is subject to change without further notice)
For some applications that do not need a very precise timing calculation, the RC
oscillator (Fig 22 & Fig 23) offers a lot of cost savings. Nevertheless, it should be noted
that the frequency of the RC oscillator is influenced by the supply voltage, the values of
the resistor (Rext), the capacitor (Cext), and even by the operation temperature.
Moreover, the frequency also changes slightly from one chip to another due to the
manufacturing process variation.
In order to maintain a stable system frequency, the values of the Cext should not be
less than 20pF, and that the value of Rext should not be greater than 1 M ohm. If they
cannot be kept in this range, the frequency is easily affected by noise, humidity, and
leakage.
The smaller the Rext in the RC oscillator, the faster its frequency will be. On the
contrary, for very low Rext values, for instance, 1 K
, the oscillator becomes unstable
because the NMOS cannot discharge the current of the capacitance correctly.
Based on the reasons above, it must be kept in mind that all of the supply voltage, the
operation temperature, the components of the RC oscillator, the package types, the
way the PCB is layout, will affect the system frequency.
OSCI
EM78P451S
Vcc
Rext
Cext
Fig. 20 Circuit for External RC Oscillator Mode
OSCI
EM78P451S
Vcc
Rext
Fig. 21 Circuit for External R, Internal C Oscillator Mode
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