參數(shù)資料
型號： MC68HC705JB2DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDSO20
封裝： SOIC-20
文件頁數(shù)： 38/128頁
文件大?。?/td> 2493K
代理商： MC68HC705JB2DW
August 28, 1998
GENERAL RELEASE SPECIFICATION
GENERAL DESCRIPTION
REV 1.1
1-5
1.
A crystal as shown in Figure 1-3(a)
2.
A ceramic resonator as shown in Figure 1-3(a)
3.
An external clock signal as shown in Figure 1-3(b)
The frequency, fOSC, of the oscillator or external clock source is divided by two to
produce the internal operating frequency, fOP. If the internal operating frequency is
3MHZ, then the external oscillator frequency will be 6MHz. For LS USB 1.5MHz
frequency clock can be derived from a divided by 4 circuit. The type of oscillator is
selected by a mask option.
1.4.2.1
Crystal Oscillator
The circuit in Figure 1-3(a) shows a typical oscillator circuit for an AT-cut, parallel
resonant crystal. The crystal manufacturer’s recommendations should be
followed, as the crystal parameters determine the external component values
required to provide maximum stability and reliable start-up. The load capacitance
values used in the oscillator circuit design should include all stray capacitances.
The crystal and components should be mounted as close as possible to the pins
for start-up stabilization and to minimize output distortion. An internal start-up
resistor of typically 2M
is provided between OSC1 and OSC2 for the crystal type
oscillator.
Figure 1-3. Oscillator Connections
1.4.2.2
Ceramic Resonator Oscillator
In cost-sensitive applications, a ceramic resonator can be used in place of the
crystal. The circuit in Figure 1-3(a) can be used for a ceramic resonator. The
resonator manufacturer’s recommendations should be followed, 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. The ceramic resonator and
MCU
37 pF
2M
unconnected
External Clock
OSC1
OSC2
MCU
(a) Crystal or Ceramic Resonator
Connections
(b) External Clock
Source Connection
OSC1
OSC2
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關PDF資料
PDF描述
MC68HC705JB2P 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP20
MC68HC705JB4P 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP28
MC68HC705K1CDW 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDSO16
MC68HC705K1CP 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDIP16
MC68HC705K1S 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, CDIP16
相關代理商/技術參數(shù)
參數(shù)描述
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