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P83C524IFA Datasheet(PDF) 67 Page - NXP Semiconductors |
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P83C524IFA Datasheet(HTML) 67 Page - NXP Semiconductors |
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67 / 76 page  1997 Dec 15 67 Philips Semiconductors Product specification 8-bit microcontrollers P83C524; P80C528; P83C528 25.1 Timing symbol definitions Oscillator: fCLK = clock frequency tCK = clock period Timing symbols (acronyms): Each timing symbol has five characters. The first character is always a 't' (= time). the remaining four characters of the symbol (typed in subscript), depending on their relative positions, indicate the name of a signal or the logical status of that signal. the designations are as follows: A =address C = clock D = input data H = logic level HIGH I = instruction (program memory contents) L = Logic level LOW or ALE P= PSEN Q = output data R= RD signal t = time V = valid W= WR signal X = no longer a valid logic level Z = float Examples: tAVLL = time for address valid to ALE LOW tLLPL = time for ALE LOW to PSEN LOW |
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