21. Shift Register Mode Timing Waveforms
22. 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 VIL max. for a logic 0.
23. 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.
14 AT89C2051
0368G–MICRO–6/05