MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 131
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MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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9.1 Contents
MC68HC908AB32
MOTOROLA
Technical Data — MC68HC908AB32
—
Rev. 1.0
Section 9. Clock Generator Module (CGM)
9.2
9.3
9.4
9.4.1
9.4.2
9.4.2.1
9.4.2.2
9.4.2.3
9.4.2.4
9.4.2.5
9.4.3
9.4.4
9.5
9.5.1
9.5.2
9.5.3
9.5.4
9.5.5
9.5.6
9.5.7
9.5.8
9.6
9.6.1
9.6.2
9.6.3
9.7
9.8
Freescale Semiconductor, Inc.
For More Information On This Product,
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
CGM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Crystal Oscillator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Phase-Locked Loop (PLL) Circuit . . . . . . . . . . . . . . . . . . . 135
Base Clock Selector Circuit . . . . . . . . . . . . . . . . . . . . . . . . 140
CGM External Connections . . . . . . . . . . . . . . . . . . . . . . . . 140
Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . . 142
Crystal Amplifier Output Pin (OSC2) . . . . . . . . . . . . . . . . . 142
External Filter Capacitor Pin (CGMXFC) . . . . . . . . . . . . . . 142
PLL Analog Power Pin (V
Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . . 142
Crystal Output Frequency Signal (CGMXCLK) . . . . . . . . . 143
CGM Base Clock Output (CGMOUT). . . . . . . . . . . . . . . . . 143
CGM CPU Interrupt (CGMINT) . . . . . . . . . . . . . . . . . . . . . 143
PLL Control Register (PCTL) . . . . . . . . . . . . . . . . . . . . . . . 144
PLL Bandwidth Control Register (PBWC) . . . . . . . . . . . . . 146
PLL Programming Register (PPG) . . . . . . . . . . . . . . . . . . . 148
Clock Generator Module (CGM)
PLL Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Acquisition and Tracking Modes . . . . . . . . . . . . . . . . . . 136
Manual and Automatic PLL Bandwidth Modes . . . . . . . 136
Programming the PLL . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Special Programming Exceptions . . . . . . . . . . . . . . . . . 139
Go to: www.freescale.com
DDA
) . . . . . . . . . . . . . . . . . . . . . . 142
Technical Data
131
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