mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 10

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mc68hc908sr12

Manufacturer Part Number
mc68hc908sr12
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet

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Table of Contents
Data Sheet
10
7.7.3
7.7.4
7.7.5
7.7.6
7.8
7.8.1
7.8.2
7.9
8.1
8.2
8.3
8.4
8.4.1
8.4.2
8.4.3
8.4.4
8.4.5
8.4.6
8.4.7
8.4.8
8.4.9
8.5
8.5.1
8.5.2
8.5.3
8.5.4
8.5.5
8.5.6
8.5.7
8.5.8
8.6
8.6.1
Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Oscillator During Break Mode. . . . . . . . . . . . . . . . . . . . . . . . . 110
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
CGM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Section 8. Clock Generator Module (CGM)
Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . . 109
CGM Oscillator Clock (CGMXCLK) . . . . . . . . . . . . . . . . . . 109
CGM Reference Clock (CGMRCLK) . . . . . . . . . . . . . . . . . 109
Oscillator Clock to Time Base Module (OSCCLK) . . . . . . . 109
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110
Oscillator Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Phase-Locked Loop Circuit (PLL) . . . . . . . . . . . . . . . . . . . 116
PLL Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Acquisition and Tracking Modes . . . . . . . . . . . . . . . . . . . . 118
Manual and Automatic PLL Bandwidth Modes. . . . . . . . . . 118
Programming the PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Special Programming Exceptions . . . . . . . . . . . . . . . . . . . 124
Base Clock Selector Circuit . . . . . . . . . . . . . . . . . . . . . . . . 124
CGM External Connections . . . . . . . . . . . . . . . . . . . . . . . . 125
External Filter Capacitor Pin (CGMXFC) . . . . . . . . . . . . . . 126
PLL Analog Power Pin (V
PLL Analog Ground Pin (V
Oscillator Output Frequency Signal (CGMXCLK) . . . . . . . 126
CGM Reference Clock (CGMRCLK) . . . . . . . . . . . . . . . . . 126
CGM VCO Clock Output (CGMVCLK) . . . . . . . . . . . . . . . . 127
CGM Base Clock Output (CGMOUT). . . . . . . . . . . . . . . . . 127
CGM CPU Interrupt (CGMINT) . . . . . . . . . . . . . . . . . . . . . 127
PLL Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Table of Contents
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
DDA
SSA
) . . . . . . . . . . . . . . . . . . . . . . 126
) . . . . . . . . . . . . . . . . . . . . . 126
Freescale Semiconductor

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