mc68hc908as60 Freescale Semiconductor, Inc, mc68hc908as60 Datasheet - Page 168

• Manufacturer Part Number: mc68hc908as60
• Description: Mc68hc908as60 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Clock Generator Module (CGM)
10.5.4 Analog Power Pin (V
10.5.5 Oscillator Enable Signal (SIMOSCEN)
10.5.6 Crystal Output Frequency Signal (CGMXCLK)
10.5.7 CGM Base Clock Output (CGMOUT)
10.5.8 CGM CPU Interrupt (CGMINT)
Technical Data
NOTE:
V
V
Route V
capacitors as close as possible to the package.
The SIMOSCEN signal enables the oscillator and PLL.
CGMXCLK is the crystal oscillator output signal. It runs at the full speed
of the crystal (f
Figure 10-3
OSC2 and may not represent the actual circuitry. The duty cycle of
CGMXCLK is unknown and may depend on the crystal and other
external factors. Also, the frequency and amplitude of CGMXCLK can be
unstable at startup.
CGMOUT is the clock output of the CGM. This signal is used to generate
the MCU clocks. CGMOUT is a 50 percent duty cycle clock running at
twice the bus frequency. CGMOUT is software programmable to be
either the oscillator output, CGMXCLK, divided by two or the VCO clock,
CGMVCLK, divided by two.
CGMINT is the CPU interrupt signal generated by the PLL lock detector.
DDA
DDA
Freescale Semiconductor, Inc.
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is a power pin used by the analog portions of the PLL. Connect the
DDA
pin to the same voltage potential as the V
DDA
)
Clock Generator Module (CGM)
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carefully for maximum noise immunity and place bypass
shows only the logical relation of CGMXCLK to OSC1 and
XCLK
) and comes directly from the crystal oscillator circuit.
MC68HC908AS60 — Rev. 1.0
DD
pin.