參數(shù)資料
型號(hào)： MC68HC05E5DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝： SOIC-28
文件頁數(shù)： 54/140頁
文件大?。?/td> 847K
代理商： MC68HC05E5DW
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Description
General Release Specification
MC68HC05E5 — Rev. 1.0
20
General Description
MOTOROLA
1.5.3 OSC1 and OSC2
These pins provide control input for an on-chip clock oscillator circuit
which can optionally drive a PLL clock. A crystal, a ceramic resonator, or
an external signal connects to these pins providing a system clock. The
oscillator frequency is two times the internal bus rate if the PLL is not
used.
Crystal
Figure 1-3 (a) shows the recommended circuit for using a crystal. The
crystal and components should be mounted as close as possible to
the input pins to minimize output distortion and startup stabilization
time.
Ceramic Resonator
A ceramic resonator may be used in place of the crystal in
cost-sensitive applications. Figure 1-3 (a) shows the recommended
circuit for using a ceramic resonator. The manufacturer of the
particular ceramic resonator being considered should be consulted
for specific information.
External Clock
An external clock should be applied to the OSC1 input with the OSC2
pin not connected (refer to Figure 1-3 (b)). This setup can be used if
the user does not wish to run the CPU with a 32.768-kHz crystal or
the PLL frequencies are not suitable for the application.
Figure 1-3. Oscillator Connections
<
OSC1
OSC2
OSC1
OSC2
MCU
EXTERNAL CLOCK
UNCONNECTED
(a) Crystal/Ceramic Resonator
(b) External Clock Source
330 k
20 M
32.768 kHz
Oscillator Connections
Connections
33 pF
10 pF
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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