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AT89S52-24AC Scheda tecnica(PDF) 32 Page - ATMEL Corporation |
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AT89S52-24AC Scheda tecnica(HTML) 32 Page - ATMEL Corporation |
32 / 39 page 32 1919C–MICRO–3/05 AT89S52 31. External Data Memory Write Cycle 32. External Clock Drive Waveforms t LHLL t LLWL t LLAX t WHLH t AVLL t WLWH t AVWL t QVWX t QVWH t WHQX A0 - A7 FROM RI OR DPL ALE PSEN WR PORT 0 PORT 2 P2.0 - P2.7 OR A8 - A15 FROM DPH A0 - A7 FROM PCL A8 - A15 FROM PCH DATA OUT INSTR IN t CHCX t CHCX t CLCX t CLCL t CHCL t CLCH V - 0.5V CC 0.45V 0.2 V - 0.1V CC 0.7 V CC 33. External Clock Drive Symbol Parameter Min Max Units 1/tCLCL Oscillator Frequency 0 33 MHz t CLCL Clock Period 30 ns t CHCX High Time 12 ns tCLCX Low Time 12 ns t CLCH Rise Time 5 ns t CHCL Fall Time 5 ns |
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