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[WORD]
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- 2008-10-13
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Description: 1. Experimental tasks:
In this experiment, the automatic counting of 0-99 is realized and displayed on the two digital tube.
2. The experiment purpose
Master the principle of digital tube dynamic display
3. Dynamic display principle
In the schematic diagram, the same eponymous end of the six strokes of all the digital tubes is connected to the P0 by 74LS573, and each digital tube's public pole COM is independently controlled by I/O line. There is a contradiction here, and all the eight strokes of the digital tube are linked together by the same name, so how do you show the different Numbers on one screen, 0,1,2,3,4, 5? Indeed, in such a connection, all digital tube displays are identical in a moment, and different Numbers cannot be displayed. In single chip microcomputer, display a number first, and then turn it off. Then show the second number, turn off again, we would see continuous digital display, take turns to light up the scanning process, each display light up time is very short (about 10 ms), due to the phenomenon of persistence of vision and afterglow effect of light-emitting diodes (leds), despite the fact that you display are not lit at the same time, but as long as the scanning speed is fast enough, the impression is a set of stable display data, there would be no light flashes.
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