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S87C552-5A68 Datasheet(PDF) 11 Page - NXP Semiconductors |
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S87C552-5A68 Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 20 page  Philips Semiconductors Product specification 80C562/83C562 Single-chip 8-bit microcontroller 1992 Jan 08 11 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 tLHLL tPLPH tLLIV tPLAZ tLLPL tAVIV SU00006 tPLIV Figure 2. External Program Memory Read Cycle tLLAX 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 DPH A0–A15 FROM PCH tWHLH tLLDV tLLWL tRLRH tRLAZ tAVLL tRHDX tRHDZ tAVWL tAVDV tRLDV SU00007 Figure 3. External Data Memory Read Cycle |
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