MC68HC705C4ACB MOTOROLA [Motorola, Inc], MC68HC705C4ACB Datasheet - Page 30

• Manufacturer Part Number: MC68HC705C4ACB
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

General Description
1.7.2.1 Crystal Resonator
1.7.2.2 Ceramic Resonator
Technical Data
30
NOTE:
The circuit in
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.
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.
To reduce cost, use a ceramic resonator instead of a crystal. Use the
circuit shown in
shown in
resonator manufacturer’s recommendations.
The external component values required for maximum stability and
reliable starting depend upon the resonator parameters. The load
capacitance values used in the oscillator circuit design should include all
Figure 1-10
Figure 1-8
General Description
Figure 1-9
Figure 1-8. Crystal Connections
22 pF
Starting value only. Follow crystal supplier’s
recommendations regarding component
values that will provide reliable startup and
maximum stability.
OSC1
for a 3-pin ceramic resonator, and follow the
shows a crystal oscillator circuit for an AT-cut,
for a 2-pin ceramic resonator or the circuit
MC68HC705C4A • MC68HSC705C4A — Rev. 3.0
10 M
2 MHz
MCU
XTAL
OSC2
22 pF
MOTOROLA