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MC68HC908GR4MP Datasheet(PDF) 77 Page - Freescale Semiconductor, Inc

Part # MC68HC908GR4MP
Description  M68HC08 Microcontrollers
PDF  286 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC908GR4MP Datasheet(HTML) 77 Page - Freescale Semiconductor, Inc

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I/O Signals
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
Freescale Semiconductor
77
Figure 7-2. CGMC External Connections
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 Figure 7-2.)
NOTE
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.
OSC1
C1
C2
SIMOSCEN
CGMXCLK
RB
X1
RS
CBYP
OSC2
CGMXFC
VDDA
Note: Filter network in box can be replaced with a 0.47
μF capacitor, but will degrade stability.
VDD
OSCSTOPENB
(FROM CONFIG)
RF1
CF2
CF1
VSSA
0.1
μF



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