FT800Q-R datasheet(15/46 Pages) BRIDGETEK

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FT800 Embedded Video Engine Datasheet

Version 1.4

Document No.: BRT_000039 Clearance No.: BRT#001

4.2 System Clock

4.2.1

Clock Source

The FT800 can be configured to use any of the three clock sources for system clock:



Internal relaxation oscillator clock



External 12MHz crystal



External 12MHz square wave clock

Figure 4-5 and Figure 4-6 shows the pin connections for these clock options. Commands CLKEXT and

CLKINT switch between internal oscillator and external crystal oscillator and are synchronised to VSYNC

on the fly.

The external crystal oscillator is recommended for applications which require higher quality audio

reproduction.

Figure 4-4 Internal Relaxation Oscillator Connection

Figure 4-5 Crystal oscillator connection

Figure 4-6 External clock input

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