MC68HC05K1 FREESCALE [Freescale Semiconductor, Inc], MC68HC05K1 Datasheet - Page 23

• Manufacturer Part Number: MC68HC05K1
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

1.6.2.1 Crystal
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
NOTE:
The circuit in
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 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 may
overdrive or have the incorrect characteristic impedance for a strip or
tuning fork crystal.
To use the crystal-driven oscillator, select the crystal/ceramic resonator
mask option when ordering the MCU. The crystal/ceramic resonator
mask option connects an internal 2-M startup resistor between OSC1
and OSC2.
Freescale Semiconductor, Inc.
27 pF
For More Information On This Product,
OSC1
(MASK OPTION)
C3
Go to: www.freescale.com
Figure 1-4
2 M
XTAL
MCU
General Description
Figure 1-4. Crystal Connections
C4
OSC2
shows a typical crystal oscillator circuit for an
27 pF
OSC1
OSC2
V
V
DD
SS
General Description
Pin Assignments
C1 C2
Technical Data
XTAL
C3
C4
V
SS