Data Sheet

Copyright © Bridgetek Pte Ltd 20
BT81X (815/6) Advanced Embedded Video Engine Datasheet
Version 1.0
Document No.: BRT_000220 Clearance No.: BRT#126
4.2 System Clock
4.2.1 Clock Source
The BT815/6 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.