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参数资料
| 型号： | MC68HC05T7B |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
| 封装： | SDIP-56 |
| 文件页数： | 37/109页 |
| 文件大小： | 9008K |
| 代理商： | MC68HC05T7B |
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Pin Descriptions
Pin Functions
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 3.0
Technical Data
MOTOROLA
Pin Descriptions
27
Figure 2-2. Bypassing Layout Recommendation
2.3.2 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 2-3 and Figure 2-4.)
2. Ceramic resonator (See Figure 2-5 and Figure 2-6.)
3. Resistor/capacitor (RC) oscillator (Refer to Appendix A.
4. External clock signal as shown in (See Figure 2-7.)
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.
2.3.2.1 Crystal Oscillator
Figure 2-3 and Figure 2-4 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.
To minimize output distortion, mount the crystal and capacitors as close
as possible to the pins. An internal startup resistor of approximately
2M
is provided between OSC1 and OSC2 for the crystal oscillator as
a programmable mask option.
NOTE:
Use an AT-cut crystal and not an AT-strip crystal because the MCU can
overdrive an AT-strip crystal.
C1
C2
MCU
C1
0.1
F
C2
V+
+
VDD
VSS
VDD
VSS
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