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| MC68HC705KJ1 Datasheet, PDF (17/108 Pages) Motorola, Inc – HCMOS Microcontroller Unit | |||
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Pin Functions
VSS
MCU
C3
OSC1
XTAL
OSC2
C3
27 pF
XTAL
C4
27 pF
C4
VDD
C2 C1
VSS
Figure 1-4. Crystal Connections with
Oscillator Internal Resistor Mask Option
MCU
R
10 Mâ¦
VSS
C3
XTAL R
OSC1
OSC2
C3
27 pF
XTAL
C4
27 pF
C4
VDD
C2 C1
VSS
Figure 1-5. Crystal Connections without
Oscillator Internal Resistor Mask Option
1.4.2.2 Ceramic Resonator Oscillator
To reduce cost, use a ceramic resonator instead of the crystal. The circuits shown in Figure 1-6 and
Figure 1-7 show ceramic resonator circuits. Follow the resonator manufacturerâs recommendations, as
the resonator parameters determine the external component values required for maximum stability and
reliable starting. The load capacitance values used in the oscillator circuit design should include all stray
capacitances.
Mount the resonator and components as close as possible to the pins for startup stabilization and to
minimize output distortion. An internal startup resistor of approximately 2 M⦠is provided between OSC1
and OSC2 as a programmable mask option.
MC68HC705KJ1 ⢠MC68HRC705KJ1 ⢠MC68HLC705KJ1 Data Sheet, Rev. 4.1
Freescale Semiconductor
17
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