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P80C32 bảng dữ liệu(PDF) 44 Page - NXP Semiconductors |
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P80C32 bảng dữ liệu(HTML) 44 Page - NXP Semiconductors |
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44 / 62 page ![]() Philips Semiconductors Product data P80C3xX2; P80C5xX2; P87C5xX2 80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz) 2003 Jan 24 44 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 27. 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 28. External Data Memory Read Cycle |
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