The 8255 control unit with keyboard and number display unit connected, the preparation of experimental procedures, scanning keyboard input, and the number of scan tube display. 4 × 4 keyboard using the keyboard, LED display for each number 0 ~ F 16 number. Within specific experiments are as follows: the keyboard number, denoted by 0 ~ F, press one button, the button should be the number in a number displayed on the tube, and then press a button, put the number keys In the next few tube display, a number of tubes can be displayed nearly 4 times pressing the button number.

Keyboard scanning and display design experiments.doc

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