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FT810Q-R 数据表(PDF) 21 Page - Bridgetek Pte Ltd. |
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FT810Q-R 数据表(HTML) 21 Page - Bridgetek Pte Ltd. |
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21 / 63 page ![]() Copyright © Bridgetek Pte Ltd 21 FT81X Embedded Video Engine Datasheet Version 1.4 Document No.: BRT_000002 Clearance No.: BRT#004 4.2.1 Clock Source The FT81x can be configured to use any of the three clock sources for system clock: Internal relaxation oscillator clock (default) External 12MHz crystal External 12MHz square wave clock Figure 4-4, Figure 4-5 and Figure 4-6 show the pin connections for these clock options. 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. |
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