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4.1MMCControlRegister(MMCCTL)
Registers
TheMMCcontrolregister(MMCCTL)isusedtoenableorconfigurevariousmodesoftheMMCcontroller.
SetorcleartheDATRSTandCMDRSTbitsatthesametimetoresetorenabletheMMCcontroller.
TheMMCcontrolregister(MMCCTL)isshowninFigure18anddescribedinTable6.
Figure18.MMCControlRegister(MMCCTL)
3116
Reserved
R-0
15111098
ReservedPERMDXPERMDRReserved
R-0R/W-0R/W-0R-0
7653210
DATEGReservedWIDTHCMDRSTDATRST
R/W-0R-0R/W-0R/W-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table6.MMCControlRegister(MMCCTL)FieldDescriptions
BitFieldValueDescription
31-11Reserved0Reserved
10PERMDXEndianselectwhenwriting.
0Littleendianisselected.
1Bigendianisselected.
9PERMDREndianselectwhenreading.
0Littleendianisselected.
1Bigendianisselected.
8Reserved0Reserved
7-6DATEG0-3hDAT3edgedetectionselect.
0DAT3edgedetectionisdisabled.
1hDAT3rising-edgedetectionisenabled.
2hDAT3falling-edgedetectionisenabled.
3hDAT3rising-edgeandfalling-edgedetectionsareenabled.
5-3Reserved0Reserved
2WIDTHDatabuswidth(MMCmodeonly).
0Databushas1bit(onlyDAT0isused).
1Databushas4bits(allDAT0-3areused).
1CMDRSTCMDlogicreset.
0CMDlineportionisenabled.
1CMDlineportionisdisabledandinresetstate.
0DATRSTDATlogicreset.
0DATlineportionisenabled.
1DATlineportionisdisabledandinresetstate.
SPRUE30B–September2006MultimediaCard(MMC)/SecureDigital(SD)CardController41
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