题目内容
To control the display of LED dot matrix display is essentially to control the level code added to the line and column lines to control the lighting of some light-emitting diodes (points), so as to display various characters composed of different light-emitting points.
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16 × 16 dot matrix display is composed of four 4 × 4 LED dot matrix displays.
LCD 1602 LCD display module, can display 2 lines, each line of 16 characters.
In the dynamic display of the digital tube, only one LED digital tube is on at any time. It is the afterglow of the LED and the "visual persistence" of the human eye that cause the "false appearance" of the digital tube display at the same time.
In order to provide the interface circuit for the 8 × 8 non coding keyboard of scanning method, two 8-bit parallel input ports and one 8-bit parallel output port are needed in the interface circuit.
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