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FT810Q 数据表(PDF) 21 Page - Future Technology Devices International Ltd. |
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FT810Q 数据表(HTML) 21 Page - Future Technology Devices International Ltd. |
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21 / 60 page  Copyright © 2015 Future Technology Devices International Limited 21 Document No.: FT_001165 FT81X Embedded Video Engine Datasheet Version 1.2 Clearance No.: FTDI#440 Figure 4-4 Internal relaxation oscillator connection Figure 4-5 Crystal oscillator connection Figure 4-6 External clock input 4.2.2 Phase Locked Loop The internal PLL takes an input clock from the oscillator, and generates clocks to all internal circuits, including the graphics engine, audio engine and touch engine. 4.2.3 Clock Enable At power-on the FT81x enters sleep mode. The internal relaxation oscillator is selected for the PLL clock source. The system clock will be enabled when the following step is executed: Host sends an “ACTIVE” command If the application chooses to use the external clock source (12MHz crystal or clock), the following steps shall be executed: Host sends a “CLKEXT” command Host sends an “ACTIVE” command |
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