MC68HC908GR4 MOTOROLA [Motorola, Inc], MC68HC908GR4 Datasheet - Page 113

• Manufacturer Part Number: MC68HC908GR4
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

7.5.6 Oscillator Enable Signal (SIMOSCEN)
7.5.7 Oscillator Stop Mode Enable Bit (OSCSTOPENB)
7.5.8 Crystal Output Frequency Signal (CGMXCLK)
7.5.9 CGMC Base Clock Output (CGMOUT)
7.5.10 CGMC CPU Interrupt (CGMINT)
MC68HC908GR8 — Rev 4.0
MOTOROLA
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.
CGMXCLK is the crystal oscillator output signal. It runs at the full speed
of the crystal (f
Figure 7-2
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 CGMC. 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 VCO clock, CGMVCLK, divided by two.
CGMINT is the interrupt signal generated by the PLL lock detector.
Freescale Semiconductor, Inc.
For More Information On This Product,
Clock Generator Module (CGMC)
shows only the logical relation of CGMXCLK to OSC1 and
Go to: www.freescale.com
XCLK
) and comes directly from the crystal oscillator circuit.
Clock Generator Module (CGMC)
Technical Data
I/O Signals
113