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4.7MMCDataReadTime-OutRegister(MMCTOD)
Registers
TheMMCdatareadtime-outregister(MMCTOD)defineshowlongtheMMCcontrollerwaitsforthedata
fromamemorycardbeforerecordingatime-outconditionintheTOUTRDbitoftheMMCstatusregister0
(MMCST0).IfthecorrespondingETOUTRDbitintheMMCinterruptmaskregister(MMCIM)isset,an
interruptisgeneratedwhentheTOUTRDbitissetinMMCST0.Ifamemorycardshouldrequirealonger
time-outperiodthanMMCTODcanprovide,asoftwaretime-outmechanismcanbeimplemented.
TheMMCdatareadtime-outregister(MMCTOD)isshowninFigure24anddescribedinTable12.
Figure24.MMCDataReadTime-OutRegister(MMCTOD)
3116
Reserved
R-0
150
TOD_15_0
R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table12.MMCDataReadTime-OutRegister(MMCTOD)FieldDescriptions
BitFieldValueDescription
31-16Reserved0Reserved
15-0TOD_15_00-1FFFFFhDatareadtime-outcount.UsedinconjunctionwiththeTOD_20_16bitsinMMCTORtoforma
21-bitcount.SeeMMCTOR(Section4.6).
0Notimeout
1-FFFFh1CLKclockcycleto2097151CLKclockcycles
MultimediaCard(MMC)/SecureDigital(SD)CardController 48SPRUE30B–September2006
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