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S83L51FA-8A44 Datasheet(PDF) 10 Page - NXP Semiconductors |
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S83L51FA-8A44 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 16 page Philips Semiconductors Product specification 87L51FA/87L51FB CMOS single-chip 3.0V 8-bit microcontrollers 1996 Aug 16 3-159 EXPLANATION OF THE AC SYMBOLS Each timing symbol has five characters. The first character is always ‘t’ (= time). The other characters, depending on their positions, indicate the name of a signal or the logical status of that signal. The designations are: 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. tPXIZ ALE PSEN PORT 0 PORT 2 A0–A15 A8–A15 A0–A7 A0–A7 tAVLL tPXIX tLLAX INSTR IN tPLIV tLHLL tPLPH tLLIV tPLAZ tLLPL tAVIV SU00056 Figure 1. External Program Memory Read Cycle ALE PSEN PORT 0 PORT 2 RD A0–A7 FROM RI OR DPL DATA IN A0–A7 FROM PCL INSTR IN P2.0–P2.7 OR A8–A15 FROM DPF A0–A15 FROM PCH tWHLH tLLDV tLLWL tRLRH tLLAX tRLAZ tAVLL tRHDX tRHDZ tAVWL tAVDV tRLDV SU00025 Figure 2. External Data Memory Read Cycle |
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