參數(shù)資料
型號： MC68HC705KJ1CP
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP16
封裝： PLASTIC, DIP-16
文件頁數(shù)： 26/117頁
文件大?。?/td> 1644K
代理商： MC68HC705KJ1CP
Introduction
Data Sheet
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 4.0
16
Introduction
MOTOROLA
1.4.1 VDD and VSS
VDD and VSS are the power supply and ground pins. The MCU operates from a
single power supply.
Very fast signal transitions occur on the MCU pins, placing high, short-duration
current demands on the power supply. To prevent noise problems, take special
care, as Figure 1-3 shows, by placing the bypass capacitors as close as possible
to the MCU. C2 is an optional bulk current bypass capacitor for use in applications
that require the port pins to source high current levels.
Figure 1-3. Bypassing Layout Recommendation
1.4.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator.
The oscillator can be driven by any of the following:
1.
Standard crystal (See Figure 1-4 and Figure 1-5.)
2.
Ceramic resonator (See Figure 1-6 and Figure 1-7.)
3.
Resistor/capacitor (RC) oscillator (Refer to Appendix A.
4.
External clock signal as shown in (See Figure 1-8.)
5.
Low speed (32 kHz) crystal connections (Refer to Appendix B.
The frequency, fOSC, of the oscillator or external clock source is divided by two to
produce the internal operating frequency, fOP.
1.4.2.1 Crystal Oscillator
Figure 1-4 and Figure 1-5 show 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 startup and maximum stability. The load capacitance values used in the
oscillator circuit design should include all stray layout capacitances.
C1
C2
MCU
C1
0.1
F
C2
V+
+
VDD
VSS
VDD
VSS
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