参数资料
型号: MC68HC05RC18FN
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 44/126页
文件大小: 1180K
代理商: MC68HC05RC18FN
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Description
General Release Specification
MC68HC05RC18 Rev. 2.1
24
General Description
Freescale Semiconductor
NOTE:
The frequency of the internal oscillator is fosc. The MCU divides the
internal oscillator by two to produce the internal clock with a frequency
of fop.
1.5.3.1 Crystal Resonator
The circuit in Figure 1-5 shows a crystal oscillator circuit for an AT-cut,
parallel resonant crystal. Follow the crystal supplier’s recommendations,
because 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 1-5. Crystal Connections
NOTE:
Use an AT-cut crystal and not a strip or tuning fork crystal. The MCU
might overdrive or have the incorrect characteristic impedance for a strip
or tuning fork crystal.
OSC1
OSC2
MCU
10 M*
30 pF*
4.2 MHz
XTAL
* Starting value only. Follow crystal supplier’s recommenda-
. tions regarding component values that will provide reliable
. startup and maximum stability.
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