MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 99
MC68HC908KX2
Manufacturer Part Number
MC68HC908KX2
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908KX2.pdf
(311 pages)
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Technical Data — MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8
7.1 Contents
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
MOTOROLA
Section 7. Internal Clock Generator Module (ICG)
7.2
7.3
7.4
7.4.1
7.4.2
7.4.2.1
7.4.2.2
7.4.2.3
7.4.2.4
7.4.3
7.4.3.1
7.4.3.2
7.4.4
7.4.4.1
7.4.4.2
7.4.4.3
7.4.5
7.4.5.1
7.4.5.2
7.5
7.5.1
7.5.2
7.5.3
7.5.4
7.5.4.1
7.5.4.2
7.5.4.3
7.5.4.4
7.5.5
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Usage Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Internal Clock Generator Module (ICG)
Clock Enable Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Internal Clock Generator . . . . . . . . . . . . . . . . . . . . . . . . . . 104
External Clock Generator . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Clock Monitor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Clock Selection Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . .113
Switching Clock Sources . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Enabling the Clock Monitor . . . . . . . . . . . . . . . . . . . . . . . . 117
Using Clock Monitor Interrupts . . . . . . . . . . . . . . . . . . . . . . 118
Quantization Error in DCO Output . . . . . . . . . . . . . . . . . . . 119
Switching Internal Clock Frequencies . . . . . . . . . . . . . . . . 121
Digitally Controlled Oscillator . . . . . . . . . . . . . . . . . . . . . 105
Modulo N Divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Frequency Comparator . . . . . . . . . . . . . . . . . . . . . . . . . 105
Digital Loop Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
External Oscillator Amplifier . . . . . . . . . . . . . . . . . . . . . . 108
External Clock Input Path . . . . . . . . . . . . . . . . . . . . . . .108
Clock Monitor Reference Generator . . . . . . . . . . . . . . . 110
Internal Clock Activity Detector . . . . . . . . . . . . . . . . . . . 111
External Clock Activity Detector . . . . . . . . . . . . . . . . . . .112
Clock Selection Switches . . . . . . . . . . . . . . . . . . . . . . . . 114
Clock Switching Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . 114
Digitally Controlled Oscillator . . . . . . . . . . . . . . . . . . . . . 119
Binary Weighted Divider . . . . . . . . . . . . . . . . . . . . . . . . 120
Variable-Delay Ring Oscillator . . . . . . . . . . . . . . . . . . . . 120
Ring Oscillator Fine-Adjust Circuit . . . . . . . . . . . . . . . . . 121
Technical Data
99
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