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AT89C51IC2-SLSCM Datasheet(PDF) 134 Page - ATMEL Corporation |
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AT89C51IC2-SLSCM Datasheet(HTML) 134 Page - ATMEL Corporation |
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134 / 146 page  134 AT89C51IC2 4301A–8051–01/04 External Program Memory Read Cycle External Data Memory Characteristics Table 97. 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 TAVWL Address to WR or RD TQVWX Data Valid to WR Transition TQVWH Data set-up to WR High TWHQX Data Hold After WR TRLAZ RD Low to Address Float TWHLH RD or WR High to ALE high |
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