MC68HC705J MOTOROLA [Motorola, Inc], MC68HC705J Datasheet - Page 27

• Manufacturer Part Number: MC68HC705J
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

1.5.2 OSC1 and OSC2
1.5.2.1 Crystal Oscillator
MC68HC705J1A — Rev. 4.0
MOTOROLA
NOTE:
The OSC1 and OSC2 pins are the connections for the on-chip oscillator.
The oscillator can be driven by any of these:
The frequency, f
by two to produce the internal operating frequency, f
Figure 1-4
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 include all stray layout capacitances.
To minimize output distortion, mount the crystal and capacitors as close
as possible to the pins. An internal startup resistor of approximately
2 M
a programmable mask option.
Use an AT-cut crystal and not an AT-strip crystal because the MCU can
overdrive an AT-strip crystal.
1. Crystal (See
2. Ceramic resonator (See
3. Resistor/capacitor (RC) oscillator (Refer to
4. External clock signal (See
MC68HRC705J1A
is provided between OSC1 and OSC2 for the crystal oscillator as
and
General Description
Figure 1-5
osc
, of the oscillator or external clock source is divided
Figure 1-4
and
show a typical crystal oscillator circuit for an
Appendix C.
and
Figure 1-6
Figure
Figure
1-8.)
and
1-5.)
MC68HSR705J1A.)
Figure
Appendix A.
op
1-7.)
.
General Description
Pin Assignments
Technical Data
27