MC68HC705V12CFN MOTOROLA [Motorola, Inc], MC68HC705V12CFN Datasheet - Page 30

• Manufacturer Part Number: MC68HC705V12CFN
• Description: The Motorola microcontroller
• Manufacturer: MOTOROLA [Motorola, Inc]

General Description
1.7.5.1 Crystal Oscillator
Advance Information
30
NOTE:
The OSC1 and OCS2 pins can accept these sets of components:
The frequency, f
by two to produce the internal operating frequency, f
The circuit in
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 startup.
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 startup stabilization and to
minimize output distortion and radiated emissions.
1. A crystal as shown in
2. A ceramic resonator as shown in
3. An external clock signal as shown in
20 pF *
*Values shown are typical. For further information, consult the crystal oscillator vendor.
(a) Crystal or Ceramic
Resonator Connections
Figure
OSC1
General Description
OSC
10 M *
Figure 1-3. Oscillator Connections
4 MHz*
MCU
, of the oscillator or external clock source is divided
1-3(a) shows a typical oscillator circuit for an
OSC2
20 pF *
Figure
1-3(a)
Figure
Figure
(b) External Clock
OSC1
1-3(a)
Source Connection
MC68HC705V12
EXTERNAL CLOCK
MCU
1-3(b)
OP
UNCONNECTED
OSC2
.
MOTOROLA
—
Rev. 3.0