MC68HC908GP32 Datasheet, PDF (122/410 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Freescale Semiconductor, Inc.
Clock Generator Module (CGMC)
7.5.3 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.
7.5.4 PLL Analog Power Pin (V_DDA)
V_DDA is a power pin used by the analog portions of the PLL. Connect the
V_DDA pin to the same voltage potential as the V_DD pin.
NOTE: Route V_DDA carefully for maximum noise immunity and place bypass
capacitors as close as possible to the package.
7.5.5 PLL Analog Ground Pin (V_SSA)
V_SSA is a ground pin used by the analog portions of the PLL. Connect
the V_SSA pin to the same voltage potential as the V_SS pin.
NOTE: Route V_SSA carefully for maximum noise immunity and place bypass
capacitors as close as possible to the package.
7.5.6 Oscillator Enable Signal (SIMOSCEN)
The SIMOSCEN signal comes from the system integration module (SIM)
and enables the oscillator and PLL.
7.5.7 Oscillator Stop Mode Enable Bit (OSCSTOPENB)
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.
Technical Data
120
MC68HC908GP32•MC68HC08GP32 — Rev. 6
Clock Generator Module (CGMC)
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