Texas Instruments TMS320x2833 series

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PLLSTS[MCLKSTS]
=1?
Yes
No
Deviceisoperatinginlimp
mode. Takeappropriate
actionforyoursystem.
DonotwritetoPLLCR.
SetPLL[MCLKOFF]=0
toenablefailedoscillator
detectlogic.
Ifrequired,
PLLSTS[DIVSEL]
cannowbechanged.
SetnewPLLCRvalue
Is
PLLSTS[PLLLOCKS]
=1?
ContinuetowaitforPLL
tolock. Thisisimportant
fortime-criticalsoftware.
SetPLLSTS[MCLKOFF]=1
todisablefailedoscillator
detectlogic
No
Yes
PLLSTS[DIVSEL]
=2or3?
No
SetPLLSTS[DIVSEL]=0
Yes
OSC and PLL Block www.ti.com
Figure 3-10. PLLCR Change Procedure Flow Chart
50 Clocking SPRUFB0C – September 2007 – Revised May 2009
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