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HC805K3GRS/D 데이터시트(PDF) 21 Page - NXP Semiconductors

부품명 HC805K3GRS/D
상세설명  The low-cost MC68HC805K3 microcontroller is a member of the M68HC805 Family of microprocessors.
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General Release Specification
Functional Pin Description
MC68HC805K3 — Rev. 1.0
General Description
21
1.7.2.1 2-Pin Crystal Oscillator
The circuit in Figure 1-3(a) shows a typical 2-pin oscillator circuit for an
AT-cut, parallel resonant crystal. The crystal manufacturer’s
recommendations should be followed, since 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. The crystal
and components should be mounted as close as possible to the pins for
startup stabilization and to minimize output distortion. An internal startup
resistor of approximately 2 M
Ω is provided between OSC1 and OSC2
when the crystal/ceramic resonator oscillator option is used.
Figure 1-3. Oscillator Connections
MCU
36 pF*
(a) 2-Pin Crystal or
Ceramic Resonator
Connections
OSC1
OSC2
36 pF*
2 M
Ω (MASK OPTION)
R
UNCONNECTED
EXTERNAL CLOCK
R
C
(b) 2-Pin
RC Oscillator
Connections
(d) External
Clock Source
Connection
(c) 3-Pin
RC Oscillator
Connections
C
OSC1
OSC2
MCU
OSC1
OSC2
MCU
OSC1
OSC2
MCU
PB1/OSC3
* Starting value only. Follow crystal
supplier’s recommendations
regarding component values that
will provide reliable startup and
maximum stability.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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