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T89C51AC2-RLSI-M 数据表(PDF) 107 Page - ATMEL Corporation |
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T89C51AC2-RLSI-M 数据表(HTML) 107 Page - ATMEL Corporation |
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107 / 117 page ![]() Draft.A - March 30, 2001 107 Preview - Confidential T89C51AC2 18.4.2. External Program Memory Characteristics Table 26. Symbol Description Symbol Parameter T Oscillator clock period TLHLL ALE pulse width TAVLL Address Valid to ALE TLLAX Address Hold After ALE TLLIV ALE to Valid Instruction In TLLPL ALE to PSEN TPLPH PSEN Pulse Width TPLIV PSEN to Valid Instruction In TPXIX Input Instruction Hold After PSEN TPXIZ Input Instruction FloatAfter PSEN TAVIV Address to Valid Instruction In TPLAZ PSEN Low to Address Float Table 27. AC Parameters for a Fix Clock (F= 40 MHz) Symbol Min Max Units T 25 ns TLHLL 40 ns TAVLL 10 ns TLLAX 10 ns TLLIV 70 ns TLLPL 15 ns TPLPH 55 ns TPLIV 35 ns TPXIX 0 ns TPXIZ 18 ns TAVIV 85 ns TPLAZ 10 ns |
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