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AT80F51-16PI Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT80F51-16PI Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 12 page AT80F51 3-13 Serial Port Timing: Shift Register Mode Test Conditions (VCC = 5.0 V ± 20%; Load Capacitance = 80 pF) Shift Register Mode Timing Waveforms Symbol Parameter 12 MHz Osc Variable Oscillator Units Min Max Min Max tXLXL Serial Port Clock Cycle Time 1.0 12tCLCL µs tQVXH Output Data Setup to Clock Rising Edge 700 10tCLCL-133 ns tXHQX Output Data Hold After Clock Rising Edge 50 2tCLCL-117 ns tXHDX 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 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. V LOAD + 0.1V Timing Reference Points V LOAD - 0.1V LOAD V V OL + 0.1V V OL - 0.1V 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 measure- ments are made at VIH min. for a logic 1 and VIL max. for a logic 0. 0.45V TEST POINTS V - 0.5V CC 0.2 V + 0.9V CC 0.2 V - 0.1V CC |
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