mc68hc908gr8vp Freescale Semiconductor, Inc, mc68hc908gr8vp Datasheet - Page 77
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mc68hc908gr8vp
Manufacturer Part Number
mc68hc908gr8vp
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908GR8VP.pdf
(286 pages)
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7.4 I/O Signals
The following paragraphs describe the CGMC I/O signals.
7.4.1 Crystal Amplifier Input Pin (OSC1)
The OSC1 pin is an input to the crystal oscillator amplifier.
7.4.2 Crystal Amplifier Output Pin (OSC2)
The OSC2 pin is the output of the crystal oscillator inverting amplifier.
7.4.3 External Filter Capacitor Pin (CGMXFC)
The CGMXFC pin is required by the loop filter to filter out phase corrections. An external filter network is
connected to this pin. (See
Freescale Semiconductor
Note: Filter network in box can be replaced with a 0.47 μF capacitor, but will degrade stability.
To prevent noise problems, the filter network should be placed as close to
the CGMXFC pin as possible, with minimum routing distances and no
routing of other signals across the network.
(FROM CONFIG)
OSCSTOPENB
OSC1
SIMOSCEN
C1
X1
RB
Figure
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
Figure 7-2. CGMC External Connections
7-2.)
OSC2
RS
C2
CGMXCLK
NOTE
RF
CF
1
1
CGMXFC
CF
2
V
SSA
V
CBYP
0.1 μF
DDA
V
DD
I/O Signals
77
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