mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 127

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

8.5.6 CGM VCO Clock Output (CGMVCLK)
8.5.7 CGM Base Clock Output (CGMOUT)
8.5.8 CGM CPU Interrupt (CGMINT)
8.6 CGM Registers
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
CGMVCLK is the clock output from the VCO. This clock can be used by
the pulse width modulator (PWM) module to generate high frequency
PWM signals. This clock is also used by the analog module as a
reference for signal sampling.
CGMOUT is the clock output of the CGM. This signal goes to the SIM,
which generates 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 divided VCO clock, CGMPCLK, divided by two.
CGMINT is the interrupt signal generated by the PLL lock detector.
The following registers control and monitor operation of the CGM:
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•
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PLL control register (PCTL)
(See
PLL bandwidth control register (PBWC)
(See
PLL multiplier select registers (PMSH and PMSL)
(See
PLL VCO range select register (PMRS)
(See
PLL reference divider select register (PMDS)
(See
Clock Generator Module (CGM)
8.6.1 PLL Control
8.6.2 PLL Bandwidth Control
8.6.3 PLL Multiplier Select
8.6.4 PLL VCO Range Select
8.6.5 PLL Reference Divider Select
Register.)
Registers.)
Register.)
Register.)
Clock Generator Module (CGM)
Register.)
CGM Registers
Data Sheet
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