參數(shù)資料
型號: MC68HC05J1AVDWR2
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, PDSO20
封裝: SOIC-20
文件頁數(shù): 40/126頁
文件大?。?/td> 1118K
代理商: MC68HC05J1AVDWR2
Technical Data
MC68HC05J1A — Rev. 1.0
20
General Description
MOTOROLA
General Description
Figure 1-3. Bypassing Layout Recommendation
1.6.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the control connections for the on-chip
oscillator. Depending on the mask option selected, the oscillator can be
driven by any one of these:
Crystal
Ceramic resonator
Resistor-capacitor (RC) network
External clock signal
The frequency of the internal oscillator is fOSC. The MCU divides the
internal oscillator output by two to produce the internal clock with a
frequency of fOP.
An internal feedback resistor between the OSC1 and OSC2 pins is
available as a mask option. The feedback resistor mask option is
available only when the crystal/ceramic resonator mask option is also
selected.
1.6.2.1 Crystal
With the crystal/ceramic resonator mask option, a crystal connected to
the OSC1 and OSC2 pins can drive the on-chip 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
VDD
VSS
C1
C2
MCU
C1
0.1 F
C2
VDD
VSS
V+
+
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