參數(shù)資料
型號： MC68HC705J1Ac
廠商： 飛思卡爾半導體(中國)有限公司
英文描述： Microcontrollers
中文描述： 微控制器
文件頁數(shù)： 27/162頁
文件大?。?/td> 1085K
代理商： MC68HC705J1AC
General Description
Pin Assignments
MC68HC705J1A — Rev. 4.0
Technical Data
General Description
1.5.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator.
The oscillator can be driven by any of these:
1.
Crystal (See
Figure 1-4
and
Figure 1-5
.)
2.
Ceramic resonator (See
Figure 1-6
and
Figure 1-7
.)
3.
Resistor/capacitor (RC) oscillator (Refer to
Appendix A.
MC68HRC705J1A
and
Appendix C. MC68HSR705J1A
.)
4.
External clock signal (See
Figure 1-8
.)
The frequency, f
osc
, of the oscillator or external clock source is divided
by two to produce the internal operating frequency, f
op
.
1.5.2.1 Crystal Oscillator
Figure 1-4
and
Figure 1-5
show a typical crystal oscillator circuit for an
AT-cut, parallel resonant crystal. Follow the crystal supplier’s
recommendations, as the crystal parameters determine the external
component values required to provide reliable startup and maximum
stability. The load capacitance values used in the oscillator circuit design
should include all stray layout capacitances.
To minimize output distortion, mount the crystal and capacitors as close
as possible to the pins. An internal startup resistor of approximately
2 M
is provided between OSC1 and OSC2 for the crystal oscillator as
a programmable mask option.
NOTE:
Use an AT-cut crystal and not an AT-strip crystal because the MCU can
overdrive an AT-strip crystal.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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