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AT89C51ID2-RDTIM Datasheet(PDF) 145 Page - ATMEL Corporation |
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AT89C51ID2-RDTIM Datasheet(HTML) 145 Page - ATMEL Corporation |
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145 / 159 page  145 AT89C51ID2 4289A–8051–09/03 External Program Memory Read Cycle External Data Memory Characteristics Table 100. Symbol Description T PLIV TPLAZ ALE PSEN PORT 0 PORT 2 A0-A7 A0-A7 INSTR IN INSTR IN INSTR IN ADDRESS OR SFR-P2 ADDRESS A8-A15 ADDRESS A8-A15 12 T CLCL T AVIV T LHLL T AVLL T LLIV T LLPL T PLPH T PXAV T PXIX T PXIZ T LLAX Symbol Parameter TRLRH RD Pulse Width TWLWH WR Pulse Width TRLDV RD to Valid Data In TRHDX Data Hold After RD TRHDZ Data Float After RD TLLDV ALE to Valid Data In TAVDV Address to Valid Data In TLLWL ALE to WR or RD T AVWL Address to WR or RD T QVWX Data Valid to WR Transition T QVWH Data Set-up to WR High T WHQX Data Hold After WR T RLAZ RD Low to Address Float T WHLH RD or WR High to ALE high |
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