參數(shù)資料
型號: MC68HC705K1
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 20/140頁
文件大?。?/td> 803K
代理商: MC68HC705K1
Technical Data
MC68HC705K1 — Rev. 2.0
General Description
General Description
1.6.2 OSC1 and OSC2
The OSC1, OSC2, and PB1/OSC3 pins are the control connections for
the 2-pin or 3-pin on-chip oscillator. The oscillator can be driven by any
of these:
Crystal
Ceramic resonator
Resistor-capacitor network
External clock signal
The frequency of the internal oscillator is f
OSC
. The MCU divides the
internal oscillator output by two to produce the internal clock with a
frequency of f
OP
.
1.6.2.1 Crystal
The circuit in
Figure 1-4
shows 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 start-up 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.
Figure 1-4. Crystal Connections
MCU
V
DD
V
SS
OSC1
OSC2
XTAL
V
SS
O
O
XTAL
C3
27 pF
C4
27 pF
2 M
C1 C2
C
C
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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