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T89C51RD2-RDTIL 数据表(PDF) 86 Page - ATMEL Corporation |
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T89C51RD2-RDTIL 数据表(HTML) 86 Page - ATMEL Corporation |
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86 / 104 page ![]() 86 T89C51RD2 4243G–8051–05/03 External Program Memory Characteristics Symbol Parameter T Oscillator clock period T LHLL ALE pulse width T AVLL Address Valid to ALE T LLAX Address Hold After ALE T LLIV ALE to Valid Instruction In T LLPL ALE to PSEN T PLPH PSEN Pulse Width T PLIV PSEN to Valid Instruction In T PXIX Input Instruction Hold After PSEN T PXIZ Input Instruction Float After PSEN T AVIV Address to Valid Instruction In T PLAZ PSEN Low to Address Float Table 46. AC Parameters for a Fix Clock Symbol -M -L Units MinMax MinMax T25 25 ns T LHLL 40 40 ns T AVLL 10 10 ns T LLAX 10 10 ns T LLIV 70 70 ns T LLPL 15 15 ns T PLPH 55 55 ns T PLIV 35 35 ns T PXIX 00 ns T PXIZ 18 18 ns T AVIV 85 85 ns T PLAZ 10 10 ns |
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