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AT89C51-24AC データシート(PDF) 14 Page - ATMEL Corporation |
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AT89C51-24AC データシート(HTML) 14 Page - ATMEL Corporation |
14 / 17 page AT89C51 14 Shift Register Mode Timing Waveforms AC Testing Input/Output Waveforms (1) Note: 1. AC Inputs during testing are driven at V CC - 0.5V for a logic 1 and 0.45V for a logic 0. Timing measurements are made at V IH min. for a logic 1 and VIL max. for a logic 0. Float Waveforms (1) Note: 1. For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs. A port pin begins to float when 100 mV change from the loaded VOH/VOL level occurs. Serial Port Timing: Shift Register Mode Test Conditions (V CC = 5.0 V ± 20%; Load Capacitance = 80 pF) Symbol Parameter 12 MHz Osc Variable Oscillator Units Min Max Min Max t XLXL Serial Port Clock Cycle Time 1.0 12t CLCL µs tQVXH Output Data Setup to Clock Rising Edge 700 10tCLCL-133 ns t XHQX Output Data Hold after Clock Rising Edge 50 2t CLCL-117 ns t XHDX Input Data Hold after Clock Rising Edge 0 0 ns tXHDV Clock Rising Edge to Input Data Valid 700 10tCLCL-133 ns t XHDV t QVXH t XLXL t XHDX t XHQX ALE INPUT DATA CLEAR RI OUTPUT DATA WRITE TO SBUF INSTRUCTION CLOCK 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 SET TI SET RI 8 VALID VALID VALID VALID VALID VALID VALID VALID 0.45V TEST POINTS V - 0.5V CC 0.2 V + 0.9V CC 0.2 V - 0.1V CC V LOAD + 0.1V Timing Reference Points V LOAD - 0.1V LOAD V V OL + 0.1V V OL - 0.1V |
同様の部品番号 - AT89C51-24AC |
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同様の説明 - AT89C51-24AC |
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