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Dead-BandGenerator(DB)Submodule
Thedead-bandsubmodulesupportsindependentvaluesforrising-edge(RED)andfalling-edge(FED)
delays.TheamountofdelayisprogrammedusingtheDBREDandDBFEDregisters.Theseare10-bit
registersandtheirvaluerepresentsthenumberoftime-baseclock,TBCLK,periodsasignaledgeis
delayedby.Forexample,theformulatocalculatefalling-edge-delayandrising-edge-delayare:
FED=DBFED×T
TBCLK
RED=DBRED×T
TBCLK
WhereT
TBCLK
istheperiodofTBCLK,theprescaledversionofSYSCLKOUT.
Forconvenience,delayvaluesforvariousTBCLKoptionsareshowninTable2-14.
Table2-14.Dead-BandDelayValuesinμSasaFunctionofDBFEDandDBRED
Dead-BandValueDead-BandDelayinμS
(1)
DBFED,DBREDTBCLK=SYSCLKOUT/1TBCLK=SYSCLKOUT/2TBCLK=SYSCLKOUT/4
10.01μS0.02μS0.04μS
50.05μS0.10μS0.20μS
100.10μS0.20μS0.40μS
1001.00μS2.00μS4.00μS
2002.00μS4.00μS8.00μS
3003.00μS6.00μS12.00μS
4004.00μS8.00μS16.00μS
5005.00μS10.00μS20.00μS
6006.00μS12.00μS24.00μS
7007.00μS14.00μS28.00μS
8008.00μS16.00μS32.00μS
9009.00μS18.00μS36.00μS
100010.00μS20.00μS40.00μS
(1)
TablevaluesarecalculatedbasedonSYSCLKOUT=100MHz.
54ePWMSubmodulesSPRU791D–November2004–RevisedOctober2007
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