MC68HC908AS60MFN MOTOROLA [Motorola, Inc], MC68HC908AS60MFN Datasheet - Page 156
MC68HC908AS60MFN
Manufacturer Part Number
MC68HC908AS60MFN
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AS60MFN.pdf
(454 pages)
- Current page: 156 of 454
- Download datasheet (6Mb)
Clock Generator Module (CGM)
10.2 Introduction
10.3 Features
Technical Data
156
10.8
10.8.1
10.8.2
10.9
10.10 Acquisition/Lock Time Specifications . . . . . . . . . . . . . . . . . . . 176
10.10.1 Acquisition/Lock Time Definitions. . . . . . . . . . . . . . . . . . . . 176
10.10.2 Parametric Influences on Reaction Time . . . . . . . . . . . . . .177
10.10.3 Choosing a Filter Capacitor . . . . . . . . . . . . . . . . . . . . . . . . 178
The clock generator module (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 8-MHz
crystals or ceramic resonators. The PLL can generate an 8-MHz bus
frequency without using a 32-MHz crystal.
Features of the CGM include:
•
•
•
•
•
Freescale Semiconductor, Inc.
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
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
CGM During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . 175
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
Clock Generator Module (CGM)
Go to: www.freescale.com
MC68HC908AS60 — Rev. 1.0
MOTOROLA
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