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AT89C51ID2-RDTIM Datasheet(PDF) 143 Page - ATMEL Corporation |
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AT89C51ID2-RDTIM Datasheet(HTML) 143 Page - ATMEL Corporation |
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143 / 159 page  143 AT89C51ID2 4289A–8051–09/03 Table 98, Table 99 and Table 105 give the frequency derating formula of the AC param- eter for each speed range description. To calculate each AC symbols. take the x value in the correponding column (-M or -L) and use this value in the formula. Example: T LLIU for -M and 20 MHz, Standard clock. x = 35 ns T 50 ns T CCIV = 4T - x = 165 ns External Program Memory Characteristics Table 97. Symbol Description Table 98. AC Parameters for a Fix Clock 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 Symbol -M -L Units Min Max Min Max T25 25 ns T LHLL 35 35 ns T AVLL 55 ns T LLAX 55 ns T LLIV n 65 65 ns T LLPL 55 ns T PLPH 50 50 ns T PLIV 30 30 ns T PXIX 00 ns T PXIZ 10 10 ns T AVIV 80 80 ns T PLAZ 10 10 ns |
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