MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 136

• Manufacturer Part Number: MC68HC908AZ32ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Clock Generator Module (CGM)
8.2 Introduction
8.3 Features
Advance Information
136
8.8.1
8.8.2
8.9
8.10
8.10.1
8.10.2
8.10.3
8.10.4
The CGM generates the crystal clock signal, CGMXCLK, which operates
at the frequency of the crystal. The CGM also generates the base clock
signal, CGMOUT, from which the system clocks are derived. CGMOUT
is based on either the crystal clock divided by two or the phase-locked
loop (PLL) clock, CGMVCLK, divided by two. The PLL is a frequency
generator designed for use with 1-MHz to 16-MHz crystals or ceramic
resonators. The PLL can generate an 8-MHz bus frequency without
using high frequency crystals.
Features of the CGM include:
Freescale Semiconductor, Inc.
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For More Information On This Product,
Phase-Locked Loop with Output Frequency in Integer Multiples of
the Crystal Reference
Programmable Hardware Voltage-Controlled Oscillator (VCO) for
Low-Jitter Operation
Automatic Bandwidth Control Mode for Low-Jitter Operation
Automatic Frequency Lock Detector
CPU Interrupt on Entry or Exit from Locked Condition
CGM During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . 156
Acquisition/Lock Time Specifications . . . . . . . . . . . . . . . . . . .156
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Acquisition/Lock Time Definitions. . . . . . . . . . . . . . . . . . . . 156
Parametric Influences on Reaction Time . . . . . . . . . . . . . . 158
Choosing a Filter Capacitor . . . . . . . . . . . . . . . . . . . . . . . . 159
Reaction Time Calculation . . . . . . . . . . . . . . . . . . . . . . . . . 159
Clock Generator Module (CGM)
Go to: www.freescale.com
68HC908AZ32A — Rev 0.0
MOTOROLA