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3.13.9VideoCaptureChannelxEventCountRegister(VCxEVTCT)
3.13.10VideoCaptureChannelBControlRegister(VCBCTL)
VideoCaptureRegisters
Thevideocapturechannelxeventcountregister(VCxEVTCT)isprogrammedwiththenumberofEDMA
eventstobegeneratedforeachcapturefield.
Aneventcountertrackshowmanyeventshavebeengeneratedandindicateswhichthresholdvalue
(VCTHRLD1orVCTHRLD2inVCxTHRLD)touseineventgenerationandintheoutgoingdatacounter.
OncetheCAPEVTCTnnumberofeventshavebeengenerated,theEDMAlogicswitchestotheother
thresholdvalue.SeeSection2.3.1.
Thevideocapturechannelxeventcountregister(VCxEVTCT)isshowninFigure3-29anddescribedin
Table3-22.
Figure3-29.VideoCaptureChannelxEventCountRegister(VCxEVTCT)
31282716
ReservedCAPEVTCT2
R-0R/W-0
1512110
ReservedCAPEVTCT1
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table3-22.VideoCaptureChannelxEventCountRegister(VCxEVTCT)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656orY/CModeRawDataModeTCIMode
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
27-16CAPEVTCT2OF(value)0-FFFhNumberofEDMAeventsetsNotused.Notused.
(YEVT,CbEVT,CrEVT)tobe
generatedforfield2capture.
DEFAULT0
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
11-0CAPEVTCT1OF(value)0-FFFhNumberofEDMAeventsetsNotused.Notused.
(YEVT,CbEVT,CrEVT)tobe
generatedforfield1capture.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_VCxEVTCT_CAPEVTCTn_symval
VideocaptureiscontrolledbythevideocapturechannelBcontrolregister(VCBCTL)shownin
Figure3-30anddescribedinTable3-23.
SPRUEM1–May2007VideoCapturePort81
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