8051 with 8255 expansion I/O port access 8 digital tube (PA port output control word, PB mouth bit strobe, digital control is used a total of cathode). This process can realize dynamic display, and can be interactive, when To modify a particular time, this place will be blinking, just like a computer cursor, like a flash of fleeting. When the input is determined automatically transferred to the next can be used to choose a different procedure to travel (look how their own come)

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