mc68hc908gp20 Freescale Semiconductor, Inc, mc68hc908gp20 Datasheet - Page 107
mc68hc908gp20
Manufacturer Part Number
mc68hc908gp20
Description
M68hc08 Family Of 8-bit Microcontroller Units Mcus
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908GP20.pdf
(406 pages)
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7.1 Contents
MC68HC908GP20
Freescale Semiconductor
Advance Information — MC68HC908GP20
—
Rev 2.1
Section 7. Clock Generator Module (CGMC)
7.2
7.3
7.4
7.4.1
7.4.2
7.4.3
7.4.4
7.4.5
7.4.6
7.4.7
7.4.8
7.4.9
7.5
7.5.1
7.5.2
7.5.3
7.5.4
7.5.5
7.5.6
7.5.7
7.5.8
7.5.9
7.5.10
7.6
7.6.1
7.6.2
7.6.3
7.6.4
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
CGMC Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Crystal Oscillator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Phase-Locked Loop Circuit (PLL) . . . . . . . . . . . . . . . . . . . 111
PLL Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Acquisition and Tracking Modes . . . . . . . . . . . . . . . . . . . .113
Manual and Automatic PLL Bandwidth Modes . . . . . . . . . 113
Programming the PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Special Programming Exceptions . . . . . . . . . . . . . . . . . . . 119
Base Clock Selector Circuit. . . . . . . . . . . . . . . . . . . . . . . . 119
CGMC External Connections . . . . . . . . . . . . . . . . . . . . . . 120
Crystal Amplifier Input Pin (OSC1) . . . . . . . . . . . . . . . . . . 121
Crystal Amplifier Output Pin (OSC2) . . . . . . . . . . . . . . . . . 121
External Filter Capacitor Pin (CGMXFC). . . . . . . . . . . . . . 122
PLL Analog Power Pin (V
PLL Analog Ground Pin (V
Oscillator Enable Signal (SIMOSCEN) . . . . . . . . . . . . . . . 122
Oscillator Stop Mode Enable Bit (OSCSTOPENB) . . . . . . 122
Crystal Output Frequency Signal (CGMXCLK) . . . . . . . . . 123
CGMC Base Clock Output (CGMOUT) . . . . . . . . . . . . . . . 123
CGMC CPU Interrupt (CGMINT). . . . . . . . . . . . . . . . . . . .123
PLL Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
PLL Bandwidth Control Register . . . . . . . . . . . . . . . . . . . 127
PLL Multiplier Select Register High. . . . . . . . . . . . . . . . . . 129
PLL Multiplier Select Register Low . . . . . . . . . . . . . . . . . . 130
DDA
SSA
) . . . . . . . . . . . . . . . . . . . . . 122
) . . . . . . . . . . . . . . . . . . . . . 122
Advance Information
107
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