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參數(shù)資料
| 型號： | MC68HC05E1MDW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 9/86頁 |
| 文件大?。?/td> | 491K |
| 代理商： | MC68HC05E1MDW |
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General Description
Functional Pin Description
MC68HC05E1 — Revision 2.0
General Release Specication
MOTOROLA
General Description
17
NOTE:
The voltage on this pin affects the mode of operation. See
1.5.3 OSC1, OSC2
These pins provide control input for an on-chip clock oscillator circuit
which can optionally drive a Phase-Locked Loop clock. A crystal, a
ceramic resonator, or an external signal connects to these pins providing
a system clock. The oscillator frequency is two times the internal bus
rate if the PLL is not used.
1.5.3.1 Crystal
Figure 1-2 shows the recommended circuit for using a crystal. The
crystal and components should be mounted as close as possible to the
input pins to minimize output distortion and start-up stabilization time.
1.5.3.2 Ceramic Resonator
A ceramic resonator may be used in place of the crystal in cost-sensitive
applications. Figure 1-2 shows the recommended circuit for using a
ceramic resonator. The manufacturer of the particular ceramic resonator
being considered should be consulted for specific information.
1.5.3.3 External Clock
An external clock should be applied to the OSC1 input with the OSC2 pin
not connected. See Figure 1-2. This setup can be used if the user does
not wish to run the CPU with a 32.768 KHz crystal or the PLL frequencies
are not suitable for the application.
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