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AT89C51ED2-RDTUM Datasheet(PDF) 119 Page - ATMEL Corporation |
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AT89C51ED2-RDTUM Datasheet(HTML) 119 Page - ATMEL Corporation |
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119 / 137 page  119 4235K–8051–05/08 AT89C51RD2/ED2 Table 25-3. AC Parameters for a Variable Clock 25.3.3 External Program Memory Read Cycle 25.3.4 External Data Memory Characteristics Symbol Type Standard Clock X2 Clock X parameter for -M range Units TLHLL Min 2 T - x T - x 15 ns TAVLL Min T - x 0.5 T - x 20 ns TLLAX Min T - x 0.5 T - x 20 ns TLLIV Max 4 T - x 2 T - x 35 ns TLLPL Min T - x 0.5 T - x 15 ns TPLPH Min 3 T - x 1.5 T - x 25 ns TPLIV Max 3 T - x 1.5 T - x 45 ns TPXIX Min x x 0 ns TPXIZ Max T - x 0.5 T - x 15 ns TAVIV Max 5 T - x 2.5 T - x 45 ns TPLAZ Max x x 10 ns 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 TPLPH T PXAV T PXIX T PXIZ T LLAX |
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