Atmel AT89C52 Data Sheet

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External Data Memory Write Cycle ALE t LHLL t WHLH PSEN t LLWL t WLWH WR PORT 0 t LLAX t AVLL A0 - A7 FROM RI OR DPL t QVWX t WHQX t QVWH DATA OUT t AVWL A0 - A7 FROM PCL INSTR IN PORT 2 P2.0 - P2.7 OR A8 - A15 FROM DPH A8 - A15 FROM PCH External Clock Drive Waveforms t CHCX 0.45V V - 0.5V CC 0.7 V CC t CHCX 0.2 V - 0.1V CC t CLCH t CLCX t CLCL t CHCL External Clock Drive Symbol Parameter Min Max Units 1/t CLCL Oscillator Frequency 0 24 MHz t CLCL Clock Period 41.6 ns t CHCX High Time 15 ns t CLCX Low Time 15 ns t CLCH Rise Time 20 ns t CHCL Fall Time 20 ns 20 AT89C52
AT89C52 . Serial Port Timing: Shift Register Mode Test Conditions The values in this table are valid for V CC = 5.0V ± 20% and Load Capacitance = 80 pF. 12 MHz Osc Variable Oscillator Symbol Parameter Min Max Min Max Units t XLXL Serial Port Clock Cycle Time 1.0 12t CLCL µs t QVXH Output Data Setup to Clock Rising Edge 700 10t CLCL -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 t XHDV Clock Rising Edge to Input Data Valid 700 10t CLCL -133 ns Shift Register Mode Timing Waveforms INSTRUCTION ALE 0 1 2 3 4 5 6 7 8 CLOCK t XHQX WRITE TO SBUF 0 1 2 3 4 5 6 7 OUTPUT DATA t QVXH t XLXL t XHDX t XHDV SET TI CLEAR RI VALID VALID VALID VALID VALID VALID VALID VALID INPUT DATA SET RI AC Testing Input/Output Waveforms (1) Float Waveforms (1) V - 0.5V CC 0.2 V + 0.9V CC 0.45V TEST POINTS 0.2 V - 0.1V CC VLOAD V + 0.1V LOAD V - 0.1V OL Timing Reference Points V LOAD - 0.1V V + 0.1V OL 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 V IL max. for a logic 0. 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 V OH /V OL level occurs. 21
Page 1 and 2: Features • Compatible with MCS-51
Page 3 and 4: AT89C52 The AT89C52 provides the fo
Page 5 and 6: AT89C52 Special Function Registers
Page 7 and 8: AT89C52 Figure 1. Timer in Capture
Page 9 and 10: AT89C52 Figure 3. Timer 2 Auto Relo
Page 11 and 12: AT89C52 Programmable Clock Out A 50
Page 13 and 14: AT89C52 Program Memory Lock Bits Th
Page 15 and 16: AT89C52 Figure 9. Programming the F
Page 17 and 18: AT89C52 Absolute Maximum Ratings* O
Page 19: AT89C52 External Program Memory Rea
Page 23 and 24: AT89C52 Packaging Information 44A,

Atmel AT89C52 Data Sheet

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