Piccolo 28035: PLLOFF bit in PLLSTS

Eliseo Tiso

In my board after pll and osc configuration (external crystal osc), configuration made like TI example, I see PLLSTS.PLLOFF bit set.

I never set this bit and the board seem work correctly. What mean this bit?...PLL is OFF?

over 15 years ago

0 Tim King61612 over 15 years ago

Expert 2355 points

That bit is doing exactly what it says. The PLL is used to get higher frequency clocks than the internal oscillator clocks. If it is off you are basically getting the oscillator clock straight into SYSCLK, which means the board will work correctly, all be it slower than possible. It is all summed up on pages 40-43 of: http://focus.ti.com/lit/ug/sprufb0d/sprufb0d.pdf

Tim

0 Eliseo Tiso over 15 years ago in reply to Tim King61612

Prodigy 50 points

Thank you for your response Tim. Now I set correctly the piccolo's pll.

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Piccolo 28035: PLLOFF bit in PLLSTS