參數(shù)資料
型號： MC68HC05PD6
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝： PLASTIC, TQFP-80
文件頁數(shù)： 75/165頁
文件大?。?/td> 841K
代理商： MC68HC05PD6
July 7, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05PD6
GENERAL DESCRIPTION
MOTOROLA
REV 1.1
1-5
1.3.2 OSC2, OSC1
These pins provide an on-chip clock oscillator circuit. A crystal, a ceramic
resonator, or an external signal connects to these pins providing a system clock.
The oscillator frequency divided by 2, 4, and 64 are available for the system clock.
An external clock signal source should be connected to OSC1 while leaving
OSC2 pin unconnected. 4 MHz is recommended at VDD=+5V.
1.3.3 XOSC2, XOSC1
XOSC has the same structure as OSC. It is the secondary oscillator run after
Power-Up and can be selected as system clock instead of OSC. It also provides
the clock source for P-Decoder. A 76.8KHz crystal is recommended.
The OSC1/XOSC1 and OSC2/XOSC2 pins are the connections for the on-chip
oscillator. The pins can accept the following sets of components:
1.
A crystal as shown in Figure 1-3(a) and Figure 1-3(a)
2.
An external clock signal as shown in Figure 1-4(b) and Figure 1-4(b)
The circuits show in Figure 1-3(a) and Figure 1-4(a) are typical oscillator circuit
for
an
AT-cut,
parallel
resonant
crystal.
The
crystal
manufacturer’s
recommendations should be followed, as the crystal parameters determine the
external component values required to provide maximum stability and reliable
start-up. The load capacitance values used in the oscillator circuit design should
include all stray capacitances. The crystal and components should be mounted as
close as possible to the pins for start-up stabilization and to minimize output
distortion. OSC and XOSC pins have mask options for feedback and damping
resistor implementations. See Section 1.2 for these mask options and Section 14
for the resistor values.
Figure 1-3. OSC Connections
Rf
OSC1
OSC2
MCU
OSC1
OSC2
MCU
MASK
OPTION
MASK
OPTION
unconnected
External Clock
(b) External
Clock Source
Connection
(a) Crystal or
Ceramic Resonator
Connections
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