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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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P89C51RB2BA датащи(PDF) 35 Page - NXP Semiconductors |
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P89C51RB2BA датащи(HTML) 35 Page - NXP Semiconductors |
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35 / 52 page  Philips Semiconductors Preliminary specification 89C51RB2/89C51RC2/ 89C51RD2 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 1999 Sep 23 35 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 29. 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 30. External Data Memory Read Cycle |
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