Description: When the keyboard has key press, judge keys, start prearcing counter, produce a certain frequency pulse, drive a buzzer and released music. And the launch of the timer T1, music show broadcast time, and drive LCD, display, and broadcast time songs.
(1) hardware circuit with P1.0 ~ P1.7 control buttons, which P1.0 ~ P1.3 scan line, P1.4 ~ P1.7 scanning column
(2) using P2.0 ~ P2.2 as the LCD RS, R/W, E control signals
(3) use P0.0 ~ P0.7 as LCD D0 ~ D7 control of signal
(4) use P3.7 mouth buzzer control
(5) circuit for 12 MHz crystal frequency work, initial circuit C1, C2 are 30 pf.
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yinyuehechengxu.txt
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