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MC68HC908AP16CFB bảng dữ liệu(PDF) 105 Page - Motorola, Inc |
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MC68HC908AP16CFB bảng dữ liệu(HTML) 105 Page - Motorola, Inc |
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105 / 440 page  Clock Generator Module (CGM) Functional Description MC68HC908AP Family — Rev. 2.5 Data Sheet MOTOROLA 105 8.3.1 Oscillator Module The oscillator module provides two clock outputs CGMXCLK and CGMRCLK to the CGM module. CGMXCLK when selected, is driven to SIM module to generate the system bus clock. CGMRCLK is used by the phase-lock-loop to provide a higher frequency system bus clock. The oscillator module also provides the reference clock for the timebase module (TBM). See Section 7. Oscillator (OSC) for detailed oscillator circuit description. See Section 12. Timebase Module (TBM) for detailed description on TBM. 8.3.2 Phase-Locked Loop Circuit (PLL) The PLL is a frequency generator that can operate in either acquisition mode or tracking mode, depending on the accuracy of the output frequency. The PLL can change between acquisition and tracking modes either automatically or manually. 8.3.3 PLL Circuits The PLL consists of these circuits: • Voltage-controlled oscillator (VCO) • Reference divider • Frequency pre-scaler • Modulo VCO frequency divider • Phase detector • Loop filter • Lock detector Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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