External Filter Capacitor Pin (Cgmxfc); Pll Analog Power Pin (Vdda ); Pll Analog Ground Pin (Vssa ); Oscillator Enable Signal (Simoscen) - Motorola MC68HC908GP32 Technical Data Manual

Clock Generator Module (CGMC)

7.5.3 External Filter Capacitor Pin (CGMXFC)

NOTE:
7.5.4 PLL Analog Power Pin (V
NOTE:
7.5.5 PLL Analog Ground Pin (V
NOTE:

7.5.6 Oscillator Enable Signal (SIMOSCEN)

7.5.7 Oscillator Stop Mode Enable Bit (OSCSTOPENB)

Technical Data
120
Freescale Semiconductor, Inc.
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.)
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.
)
DDA
V is a power pin used by the analog portions of the PLL. Connect the
DDA
V pin to the same voltage potential as the V
DDA
Route V carefully for maximum noise immunity and place bypass
DDA
capacitors as close as possible to the package.
)
SSA
V is a ground pin used by the analog portions of the PLL. Connect
SSA
the V pin to the same voltage potential as the V
SSA
Route V carefully for maximum noise immunity and place bypass
SSA
capacitors as close as possible to the package.
The SIMOSCEN signal comes from the system integration module (SIM)
and enables the oscillator and PLL.
OSCSTOPENB is a bit in the CONFIG register that enables the oscillator
to continue operating during stop mode. If this bit is set, the Oscillator
continues running during stop mode. If this bit is not set (default), the
oscillator is controlled by the SIMOSCEN signal which will disable the
oscillator during stop mode.
Clock Generator Module (CGMC)
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pin.
DD
pin.
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MC68HC908GP32 MC68HC08GP32
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Rev. 6
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MOTOROLA