參數(shù)資料
型號: MC80F0224
廠商: Electronic Theatre Controls, Inc.
元件分類: 8位微控制器
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 8位單晶片微控制器
文件頁數(shù): 107/128頁
文件大小: 1408K
代理商: MC80F0224
Preliminary
MC80F0208/16/24
MAR. 2005 Ver 0.2
103
22. OSCILLATOR CIRCUIT
The MC80F0208/16/24 have oscillation circuits internally. X
IN
and X
OUT
are input and output for frequency. Respectively, in-
verting amplifier which can be configured for being used as an
on-chip oscillator, as shown in Figure 22-1.
Figure 22-1 Oscillation Circuit
Oscillation circuit is designed to be used either with a ceramic
resonator or crystal oscillator. Since each crystal and ceramic res-
onator have their own characteristics, the user should consult the
crystal manufacturer for appropriate values of external compo-
nents.
In addition, see Figure 22-2 for the layout of the crystal.
Note:
Minimize the wiring length. Do not allow the wiring to
intersect with other signal conductors. Do not allow the wir-
ing to come near changing high current. Set the potential of
the grounding position of the oscillator capacitor to that of
V
SS
. Do not ground it to any ground pattern where high cur-
rent is present. Do not fetch signals from the oscillator.
Figure 22-2 Layout of Oscillator PCB circuit
X
OUT
X
IN
V
SS
C1
C2
X
OUT
X
IN
External Clock
Open
External Oscillator
Crystal or Ceramic Oscillator
8MHz
Recommended
C1,C2 = 20pF ± 10pF
Crystal Oscillator
Ceramic Resonator
C1,C2 = 20pF ± 10pF
X
OUT
X
IN
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