XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 182

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

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
182
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
circuit.
OSC1 and 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% 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
is a power pin used by the analog portions of the PLL. Connect the
DDA
pin to the same voltage potential as the V
Figure 10-3
DDA
)
Clock Generator Module (CGM)
carefully for maximum noise immunity and place bypass
CGMXCLK
shows only the logical relation of CGMXCLK to
) and comes directly from the crystal oscillator
MC68HC908AZ60A — Rev 2.0
DD
pin.
MOTOROLA