AT89C2051-24SU datasheet(14/20 Pages) ATMEL

Part #	AT89C2051-24SU

Description	8-bit Microcontroller with 2K Bytes Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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14

0368G–MICRO–6/05

AT89C2051

21. Shift Register Mode Timing Waveforms

22. 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 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.

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