參數(shù)資料
型號(hào)： MC68HC05J1
廠商： Motorola, Inc.
英文描述： HCMOS MICROCONTROLLER UNIT
中文描述： HCMOS微控制器
文件頁(yè)數(shù)： 16/82頁(yè)
文件大小： 327K
代理商： MC68HC05J1
MOTOROLA
2-2
PIN DESCRIPTIONS
MC68HC705J2
Rev. 2
1
2
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9
10
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12
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2.1 V
DD
and V
SS
V
DD
and V
SS
are the power supply and ground pins. The MCU operates from a
single 5-V power supply.
Very fast signal transitions occur on the MCU pins. The short rise and fall times
place very high short-duration current demands on the power supply. To prevent
noise problems, take special care to provide good power supply bypassing at the
MCU. Use bypass capacitors with good high-frequency characteristics, and
position them as close to the MCU as possible. Bypassing requirements vary,
depending on how heavily loaded the MCU pins are.
2.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the control connections for the on-chip oscillator.
Connect any of the following to the OSC1 and OSC2 pins:
A crystal (Refer to
Figure 2-2
.)
A ceramic resonator (Refer to
Figure 2-2
)
An external clock signal (Refer to
Figure 2-3
)
The MCU divides the frequency, f
osc
, of the oscillator or external clock source by
two to produce the internal operating frequency, f
op
.
2.2.1 Crystal
The circuit in
Figure 2-2
shows a typical crystal oscillator circuit for a parallel
resonant crystal. Follow the crystal supplier's recommendations, 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 layout capacitances. Mount the
crystal and components as close as possible to the pins for start-up stabilization
and to minimize output distortion.
2.2.2 Ceramic Resonator
In cost-sensitive applications, use a ceramic resonator in place of the crystal. Use
the circuit in
Figure 2-2
for a ceramic resonator, and follow the resonator
manufacturer's recommendations, 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 layout capacitances.
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