mc68hc908mr8 Freescale Semiconductor, Inc, mc68hc908mr8 Datasheet - Page 123

• Manufacturer Part Number: mc68hc908mr8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

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)
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
NOTE:
The following paragraphs describe the CGM input/output (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
Refer to manufacturer’s data.
S
can be 0 (shorted) when used with higher-frequency crystals.
SIMOSCEN
Clock Generator Module (CGM)
OSC1
C1
Figure 8-3. CGM External Connections
R
X1
B
OSC2
R
C2
S
*
F
should be placed as close to the
CGMXCLK
F
connection.
V
SS
Clock Generator Module (CGM)
CGMXFC
C
F
Technical Data
I/O Signals
V
C
DDA
BYP
V
DD
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