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| MC68HC08AS20 Datasheet, PDF (101/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers | |||
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SIMOSCEN
OSC1
RB
X1
C1
CGMXCLK
OSC2
VSS
RS*
C2
CGMXFC
CF
VDDA/VDDAREF
VDD
CBYP
*RS can be zero (shorted) when used with higher-frequency crystals. Refer to manufacturerâs data.
Figure 8-2. CGM External Connections
8.5 I/O Signals
The following paragraphs describe the CGM I/O signals.
8.5.1 Crystal Amplifier Input Pin (OSC1)
The OSC1 pin is an input to the crystal oscillator amplifier.
8.5.2 Crystal Amplifier Output Pin (OSC2)
The OSC2 pin is the output of the crystal oscillator inverting amplifier.
8.5.3 External Filter Capacitor Pin (CGMXFC)
The CGMXFC pin is required by the loop filter to filter out phase
corrections. A small external capacitor is connected to this pin.
NOTE:
To prevent noise problems, CF should be placed as close to the
CGMXFC pin as possible, with minimum routing distances and no
routing of other signals across the CF connection.
MC68HC08AS20 â Rev. 4.1
Freescale Semiconductor
Advance Information
101
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