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4.4MMCStatusRegister1(MMCST1)
Registers
TheMMCstatusregister1(MMCST1)recordsspecificeventsorerrors.Therearenointerrupts
associatedwiththeseeventsorerrors.
TheMMCstatusregister1(MMCST1)isshowninFigure21anddescribedinTable9.
Figure21.MMCStatusRegister1(MMCST1)
3116
Reserved
R-0
158
Reserved
R-0
76543210
ReservedFIFOFULFIFOEMPDAT3STDRFULDXEMPCLKSTPBUSY
R-0R-0R-0R-0R-0R-0R-1R-0
LEGEND:R=Readonly;-n=valueafterreset
Table9.MMCStatusRegister1(MMCST1)FieldDescriptions
BitFieldValueDescription
31-7Reserved0Reserved
6FIFOFULFIFOisfull.
0FIFOisnotfull.
1FIFOisfull.
5FIFOEMPFIFOisempty.
0FIFOisnotempty.
1FIFOisempty.
4DAT3STDAT3status.
0ThesignallevelontheDAT3pinisalogic-lowlevel.
1ThesignallevelontheDAT3pinisalogic-highlevel.
3DRFULDatareceiveregister(MMCDRR)isfull.
0Adatareceiveregisterfullconditionisnotdetected.Thedatareceiveshiftregisterisnotfull.
1Adatareceiveregisterfullconditionisdetected.Thedatareceiveshiftregisterisfull.Nonewbitscan
beshiftedinfromthememorycard.
2DXEMPDatatransmitregister(MMCDXR)isempty.
0Adatatransmitregisteremptyconditionisnotdetected.Thedatatransmitshiftregisterisnotempty.
1Adatatransmitregisteremptyconditionisdetected.Thedatatransmitshiftregisterisempty.Nobits
areavailabletobeshiftedouttothememorycard.
1CLKSTPClockstopstatus.
0CLKisactive.Thememoryclocksignalisbeingdrivenonthepin.
1CLKisheldlowbecauseofamanualstop(CLKEN=0inMMCCLK),receiveshiftregisterisfull,or
transmitshiftregisterisempty.
0BUSYBusy.
0Nobusysignalisdetected.
1Abusysignalisdetected(thememorycardisbusy).
SPRUE30B–September2006MultimediaCard(MMC)/SecureDigital(SD)CardController45
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