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.Data?can?be?shifted?in?from?the?SI?pin?into?either?buffer?1?or?buffer?2.?To?load?data?into?eitherbuffer,?an?8-bit?opcode,?84H?for?buffer?1?or?87H?for?buffer?2,?must?be?followed?by?15?don’t?carebits?and?nine?address?bits?(BFA8?-?BFA0).?The?nine?address?bits?specify?the?first?byte?in?thebuffer?to?be?written.?The?data?is?entered?following?the?address?bits.?If?the?end?of?the?data?buffer?isreached,?the?device?will?wrap?around?back?to?the?beginning?of?the?buffer.?Data?will?continue?to?beloaded?into?the?buffer?until?a?low-to-high?transition?is?detected?on?the?CS?pin.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?EraseMain?Memory?Page?Program?Through?BufferThis?operation?is?a?combination?of?the?Buffer?Write?and?Buffer?to?Main?Memory?Page?Programwith?Built-in?Erase?operations.?Data?is?first?shifted?into?buffer?1?or?buffer?2?from?the?SI?pin?andthen?programmed?into?a?specified?page?in?the?main?memory.?To?initiate?the?operation,?an?8-bitopcode,?82H?for?buffer?1?or?85H?for?buffer?2,?must?be?followed?by?the?four?reserved?bits?and?20address?bits.?The?11?most?significant?address?bits?(PA10?-?PA0)?select?the?page?in?the?mainSuccessive?page?programming?operations?without?doing?a?page?erase?are?not?recommended.?Inother?words,?changing?bytes?within?a?page?from?a?“1”?to?a?“0”?during?multiple?page?programmingoperations?without?erasing?that?page?is?not?recommended.Additional?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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