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| MC68HC08AS32 Datasheet, PDF (97/280 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs) | |||
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The series resistor (RS) is included in the diagram to follow strict Pierce oscillator
guidelines and may not be required for all ranges of operation, especially with
high-frequency crystals. Refer to the crystal manufacturerâs data for more
information.
Figure 5-3 also shows the external components for the PLL:
⢠Bypass capacitor, CBYP
⢠Filter capacitor, CF
Routing should be done with great care to minimize signal cross talk and noise.
(See 5.9 Acquisition/Lock Time Specifications for routing information and more
information on the filter capacitorâs value and its effects on PLL performance.)
SIMOSCEN
CGMXCLK
OSC1
OSC2
VSS
RS*
RB
X1
C1
C2
CGMXFC
CF
VDDA/VDDAREF
VDD
CBYP
*RS can be 0 (shorted) when used with higher-frequency crystals. Refer to manufacturerâs data.
Figure 5-3. CGM External Connections
5.4 I/O Signals
The following paragraphs describe the CGM input/output (I/O) signals.
5.4.1 Crystal Amplifier Input Pin (OSC1)
The OSC1 pin is an input to the crystal oscillator amplifier.
5.4.2 Crystal Amplifier Output Pin (OSC2)
The OSC2 pin is the output of the crystal oscillator inverting amplifier.
MC68HC08AS32 â Rev. 4.1
Freescale Semiconductor
Data Sheet
97
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