データシートサーチシステム |
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AT89S51 データシート(PDF) 26 Page - ATMEL Corporation |
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AT89S51 データシート(HTML) 26 Page - ATMEL Corporation |
26 / 32 page 26 2487C–MICRO–03/05 AT89S51 31. Shift Register Mode Timing Waveforms 32. AC Testing Input/Output Waveforms (1) Note: 1. AC Inputs during testing are driven at VCC - 0.5V for a logic 1 and 0.45V for a logic 0. Timing measurements are made at VIH min. for a logic 1 and V IL max. for a logic 0. 33. 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 a 100 mV change from the loaded VOH/VOL level occurs. 30. Serial Port Timing: Shift Register Mode Test Conditions The values in this table are valid for V CC = 4.0V to 5.5V and Load Capacitance = 80 pF. Symbol Parameter 12 MHz Osc Variable Oscillator Units Min Max Min Max tXLXL Serial Port Clock Cycle Time 1.0 12 tCLCL µs t QVXH Output Data Setup to Clock Rising Edge 700 10 t CLCL-133 ns t XHQX Output Data Hold After Clock Rising Edge 50 2 t CLCL-80 ns tXHDX Input Data Hold After Clock Rising Edge 0 0 ns t XHDV Clock Rising Edge to Input Data Valid 700 10 t CLCL-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 - AT89S51_05 |
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同様の説明 - AT89S51_05 |
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