參數(shù)資料
型號(hào)： HE84760B
廠商： King Billion Electronics Co., Ltd.
英文描述： 8-bit Micro-controller
中文描述： 8位微控制器
文件頁(yè)數(shù)： 23/51頁(yè)
文件大?。?/td> 487K
代理商： HE84760B
KING BILLION ELECTRONICS CO., LTD
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HE84760B
HE80004 Series
June 29, 2005
This specification is subject to change without notice. Please contact sales person for the latest version before use.
23
V1.0
12.
Oscillators
The MCU is equipped with two clock sources with a variety of selections on the types of oscillators to
choose from. The system designer can select oscillator types based on the cost target, timing accuracy
requirements etc. Crystal, Resonator or the RC oscillator can be used as fast clock source, components
should be placed as close to the pins as possible. The type of oscillator used is selected by mask option
MO_FXTAL.
MO_FXTAL
0
1
Fast clock type
RC Oscillator.
Crystal Oscillator.
FXI
FXI
FXO
FXO
Crystal Osc.
RC Osc.
The RC oscillator has a built-in capacitor. An external resistor is needed to connect from FXI to GND to
determine the oscillation frequency. The capacitance of internal RC oscillator is selected by mask option
MO_RCAP[2..0].
MO_RCAP[2:0]
000
001
010
011
100
101
110
111
Internal RC Cap. (pF)
2
4
7
14
20
40
50
60
The following table shows the combinations of R and C, and the resulting frequency. Please note that
oscillation frequency in the table only represents oscillation frequencies of certain samples. The actual
oscillation frequency may vary up to
±
15% from lot to lot due to process parameter variations. User must
take this into consideration when using this chip in applications.
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