Ready/Busy?status?is?indicated?using?bit?7?of?the?status?register.?If?bit?7?is?a?1,?then?the?device?isnot?busy?and?is?ready?to?accept?the?next?command.?If?bit?7?is?a?0,?then?the?device?is?in?a?busystate.?The?user?can?continuously?poll?bit?7?of?the?status?register?by?stopping?SCK?at?a?low?levelonce?bit?7?has?been?output.?The?status?of?bit?7?will?continue?to?be?output?on?the?SO?pin,?and?oncethe?device?is?no?longer?busy,?the?state?of?SO?will?change?from?0?to?1.?There?are?eight?operationswhich?can?cause?the?device?to?be?in?a?busy?state:?Main?Memory?Page?to?Buffer?Transfer,?MainMemory?Page?to?Buffer?Compare,?Buffer?to?Main?Memory?Page?Program?with?Built-in?Erase,Buffer?to?Main?Memory?Page?Program?without?Built-in?Erase,?Page?Erase,?Block?Erase,?MainMemory?Page?Program,?and?Auto?Page?Rewrite.Both?the?erase?and?the?programming?ofthe?page?are?internally?self-timed?and?should?take?place?in?a?maximum?time?of?tEP.?During?thistime,?the?status?register?will?indicate?that?the?part?is?busy.Buffer?to?Main?Memory?Page?Program?without?Built-in?EraseThe?device?density?is?indicated?using?bits?5,?4,?3?and?2?of?the?status?register.?For?theAT45DB041B,?the?four?bits?are?0,?1,?1?and?1.?The?decimal?value?of?these?four?binary?bits?doesnot?equate?to?the?device?density;?the?four?bits?represent?a?combinational?code?relating?to?differingdensities?of?Serial?DataFlash?devices,?allowing?a?total?of?sixteen?different?density?configurations.The?erase?operation?is?internally?self-timed?and?should?take?place?in?a?maximum?time?of?tPE.?During?this?time,?the?status?register?will?indicate?that?the?part?is?busyBlock?EraseA?block?of?eight?pages?can?be?erased?at?one?time?allowing?the?Buffer?to?Main?Memory?Page?Program?withBuffer?to?Main?Memory?Page?Program?with?Built-in?EraseData?written?into?either?buffer?1?or?buffer?2?can?be?programmed?into?the?main?memory.?To?startthe?operation,?an?8-bit?opcode,?83H?for?buffer?1?or?86H?for?buffer?2,?must?be?followed?by?the?fourreserved?bits,?11?address?bits?(PA10?-?PA0)?that?specify?the?page?in?the?main?memory?to?be?written,?and?nine?additional?don’t?care?bits.?When?a?low-to-high?transition?occurs?on?the?CS?pin,?thepart?will?first?erase?the?selected?page?in?main?memory?to?all?1s?and?then?program?the?data?storedin?the?buffer?into?the?specified?page?in?the?main?memory.?place?in?a?maximum?time?of?tP.?During?this?time,?the?status?register?will?indicate?that?the?part?isAdditional?Commands?Main?Memory?Page?to?Buffer?TransferA?page?of?data?can?be?transferred?from?the?main?memory?to?either?buffer?1?or?buffer?2.?To?startthe?operation,?an?8-bit?opcode,?53H?for?buffer?1?and?55H?for?buffer?2,?must?be?followed?by?thefour?reserved?bits,?11?address?bits?(PA10?-?PA0)?which?specify?the?page?in?main?memory?that?isto?be?transferred,?and?nine?don’t?care?bits.?The?CS?pin?must?be?low?while?toggling?the?SCK?pin?toload?the?opcode,?the?address?bits,?and?the?don’t?care?bits?from?the?SI?pin.?The?transfer?of?thepage?of?data?from?the?main?memory?to?the?buffer?will?begin?when?the?CS?pin?transitions?from?alow?to?a?high?state.?During?the?transfer?of?a?page?of?data?(tXFR),?the?status?register?can?be?read?todetermine?whether?the?transfer?has?been?completed?or?not.

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