MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 109
MC68HC708AS48
Manufacturer Part Number
MC68HC708AS48
Description
Advance Information
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC68HC708AS48.pdf
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8.5 I/O Signals
8.5.1 Crystal Amplifier Input Pin (OSC1)
8.5.2 Crystal Amplifier Output Pin (OSC2)
8.5.3 External Filter Capacitor Pin (CGMXFC)
MC68HC708AS48
MOTOROLA
*R
S
NOTE:
can be 0 (shorted) when used with higher-frequency crystals. Refer to manufacturer’s data.
SIMOSCEN
—
Rev. 4.0
OSC1
C
1
The following paragraphs describe the CGM I/O signals.
The OSC1 pin is an input to the crystal oscillator amplifier.
The OSC2 pin is the output of the crystal oscillator inverting amplifier.
The CGMXFC pin is required by the loop filter to filter out phase
corrections. A small external capacitor is connected to this pin.
To prevent noise problems, C
CGMXFC pin as possible, with minimum routing distances and no
routing of other signals across the C
R
X
B
1
Figure 8-3. CGM External Connections
OSC2
R
Clock Generator Module (CGM)
C
S
*
2
CGMXCLK
V
SS
F
should be placed as close to the
F
connection.
CGMXFC
C
F
Clock Generator Module (CGM)
V
C
DDA
Advance Information
BYP
/V
V
DDAREF
DD
I/O Signals
109
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