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6.5.1VICControlRegister(VICCTL)
VICPortRegisters
TheVICcontrolregister(VICCTL)isshowninFigure6-3anddescribedinTable6-4.
Figure6-3.VICControlRegister(VICCTL)
3116
Reserved
R-0
154310
ReservedPRECISIONGO
R-0R/W-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table6-4.VICControlRegister(VICCTL)FieldDescriptions
Bitfieldsymval
(1)
ValueDescription
31-4Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
3-1PRECISIONOF(value)0-7hPrecisionbitsdeterminetheresolutionoftheinterpolation.ThePRECISIONbitscan
onlybewrittenwhentheGObitisclearedto0.IftheGObitissetto1,awritetothe
PRECISIONbitsdoesnotchangethebits.
DEFAULT016bits
16BITS
15BITS1h15bits
14BITS2h14bits
13BITS3h13bits
12BITS4h12bits
11BITS5h11bits
10BITS6h10bits
9BITS7h9bits
0GOOF(value)TheGObitcanbewrittentoatanytime.
DEFAULT0TheVICDIVandVICCTLregisterscanbewrittentowithoutaffectingtheoperationof
theVICport.AllthelogicintheVICportisheldinresetstateanda0isoutputonthe
0
VCTLoutputline.AwritetoVICCTLbitsaswellassettingGOto1isallowedina
singlewriteoperation.TheVICCTLbitschangeandtheGObitisset,disallowingany
furtherchangestotheVICCTLandVICDIVregisters.
11TheVICDIVandVICCTL(exceptfortheGObit)registerscannotbewritten.Ifawrite
isperformedtotheVICDIVorVICCTLregisterswhentheGObitisset,thevaluesof
theseregistersremainunchanged.IfawriteisperformedthatclearstheGObitto0
andchangesthevaluesofotherVICCTLbits,itresultsinGO=0whilekeepingthe
restoftheVICCTLbitsunchanged.TheVICportisinitsnormalworkingmodeinthis
state.
(1)
ForCSLimplementation,usethenotationVIC_VICCTL_field_symval
SPRUEM1–May2007VCXOInterpolatedControlPort171
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