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| MC68HC05K0 Datasheet, PDF (23/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit | |||
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Freescale Semiconductor, Inc.
General Description
Pin Assignments
1.6.2.1 Crystal
The circuit in Figure 1-4 shows a typical crystal oscillator circuit for an
AT-cut, parallel resonant crystal. Follow the crystal supplierâs
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.
MCU
2 Mâ¦
(MASK OPTION)
OSC1
OSC2
27 pF
XTAL
C3
C4
27 pF
OSC1
OSC2
VSS
VDD
VSS
C3
XTAL
C4
C1 C2
Figure 1-4. Crystal Connections
NOTE:
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.
MC68HC05K0 ⢠MC68HC05K1 â Rev. 2.0
General Description
For More Information On This Product,
Go to: www.freescale.com
Technical Data
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