參數(shù)資料
型號: MC68HC05K0CDWR3
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO16
封裝: SOIC-16
文件頁數(shù): 71/154頁
文件大小: 1544K
代理商: MC68HC05K0CDWR3
General Description
Pin Assignments
MC68HC05K0 MC68HC05K1 — Rev. 2.0
Technical Data
MOTOROLA
General Description
23
1.6.2.1 Crystal
The circuit in Figure 1-4 shows 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 account for all stray layout capacitances. To minimize output
distortion, mount the crystal and capacitors as close as possible to the
pins.
Figure 1-4. Crystal Connections
NOTE:
Use an AT-cut crystal and not a strip or tuning fork crystal. The MCU may
overdrive or have the incorrect characteristic impedance for a strip or
tuning fork crystal.
To use the crystal-driven oscillator, select the crystal/ceramic resonator
mask option when ordering the MCU. The crystal/ceramic resonator
mask option connects an internal 2-M
startup resistor between OSC1
and OSC2.
MCU
VDD
VSS
OSC1
OSC2
XTAL
VSS
OSC1
OSC2
XTAL
27 pF
2 M
C1 C2
C4
C3
(MASK OPTION)
C3
C4
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