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68HC908MR24 Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc |
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68HC908MR24 Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc |
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9 / 406 page  Table of Contents MC68HC908MR24 — Rev. 4.1 Advance Information Freescale Semiconductor Table of Contents 9 8.5 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 8.5.1 Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . . 121 8.5.2 Crystal Amplifier Output Pin (OSC2) . . . . . . . . . . . . . . . . . 121 8.5.3 External Filter Capacitor Pin (CGMXFC) . . . . . . . . . . . . . . 122 8.5.4 PLL Analog Power Pin (VDDA) . . . . . . . . . . . . . . . . . . . . . .122 8.5.5 Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . . 122 8.5.6 Crystal Output Frequency Signal (CGMXCLK) . . . . . . . . . 122 8.5.7 CGM Base Clock Output (CGMOUT). . . . . . . . . . . . . . . . . 122 8.5.8 CGM CPU Interrupt (CGMINT) . . . . . . . . . . . . . . . . . . . . . 123 8.6 CGM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 8.6.1 PLL Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 8.6.2 PLL Bandwidth Control Register . . . . . . . . . . . . . . . . . . . . 126 8.6.3 PLL Programming Register . . . . . . . . . . . . . . . . . . . . . . . . 128 8.7 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 8.8 Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 8.9 Acquisition/Lock Time Specifications . . . . . . . . . . . . . . . . . . . 130 8.9.1 Acquisition/Lock Time Definitions. . . . . . . . . . . . . . . . . . . . 130 8.9.2 Parametric Influences on Reaction Time . . . . . . . . . . . . . . 132 8.9.3 Choosing a Filter Capacitor . . . . . . . . . . . . . . . . . . . . . . . . 133 8.9.4 Reaction Time Calculation . . . . . . . . . . . . . . . . . . . . . . . . . 133 Section 9. Pulse-Width Modulator for Motor Control (PWMMC) 9.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 9.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 9.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 9.4 Timebase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 9.4.1 Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 9.4.2 Prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 9.5 PWM Generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 9.5.1 Load Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 9.5.2 PWM Data Overflow and Underflow Conditions. . . . . . . . . 148 |
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