參數(shù)資料
型號(hào)： 68HC05M68HC
廠商： Motorola, Inc.
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 23/130頁
文件大?。?/td> 1541K
代理商： 68HC05M68HC
General Description
Functional Pin Description
MC68HC705P6A
—
Rev. 2.0
Advance Information
MOTOROLA
General Description
23
Figure 1-2. Oscillator Connections
1.4.2.1 Crystal
The circuit in
Figure 1-2
(a)
shows a typical oscillator circuit for an
AT-cut, parallel resonant crystal. Follow the crystal manufacturer
’
s
recommendations, as the crystal parameters determine the external
component values required to provide maximum stability and reliable
startup. The load capacitance values used in the oscillator circuit design
should include all stray capacitances. Mount the crystal and components
as close as possible to the pins for startup stabilization and to minimize
output distortion.
1.4.2.2 Ceramic Resonator
In cost-sensitive applications, use a ceramic resonator in place of a
crystal. Use the circuit in
Figure 1-2
(a)
for a ceramic resonator and
follow the resonator manufacturer
’
s recommendations, as the resonator
parameters determine the external component values required for
maximum stability and reliable starting. The load capacitance values
used in the oscillator circuit design should include all stray capacitances.
Mount the resonator and components as close as possible to the pins for
startup stabilization and to minimize output distortion.
To V
DD
(or STOP
)
To V
DD
(or STOP)
(a)
Crystal or Ceramic
Resonator Connections
(b)
External Clock Source
Connections
OSC1
OSC2
MCU
37 pF
37 pF
4.7 M
MCU
OSC1
OSC2
UNCONNECTED
EXTERNAL CLOCK
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