参数资料
型号: MC68HC08QT2VDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封装: EIAJ, SOIC-8
文件页数: 170/178页
文件大小: 2311K
代理商: MC68HC08QT2VDW
Functional Description
MC68HC08QY/QT Family Data Sheet, Rev. 1
Freescale Semiconductor
91
11.3.4 XTAL Oscillator
The XTAL oscillator circuit is designed for use with an external crystal or ceramic resonator to provide an
accurate clock source. In this configuration, the OSC2 pin is dedicated to the external crystal circuit. The
OSC2EN bit has no effect when this clock mode is selected.
In its typical configuration, the XTAL oscillator is connected in a Pierce oscillator configuration, as shown
in Figure 11-2. This figure shows only the logical representation of the internal components and may not
represent actual circuitry.
The oscillator configuration uses five components:
Crystal, X1
Fixed capacitor, C1
Tuning capacitor, C2 (can also be a fixed capacitor)
Feedback resistor, R
B
Series resistor, R
S (optional)
NOTE
The series resistor (R
S) is included in the diagram to follow strict Pierce
oscillator guidelines and may not be required for all ranges of operation,
especially with high frequency crystals. Refer to the oscillator
characteristics table in the Electricals section for more information.
Figure 11-2. XTAL Oscillator External Connections
C1
C2
XTALCLK
RB
X1
RS
MCU
OSC2
OSC1
÷ 2
BUSCLKX2
BUSCLKX4
See the electrical section for details.
SIMOSCEN (INTERNAL SIGNAL) OR
OSCENINSTOP (BIT LOCATED IN
CONFIGURATION REGISTER)
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