Functional realization of single-chip microcomputer system composed of 89C51, 74LS273 and 74LS244

Publisher:温馨家园Latest update time:2011-08-23 Source: 单片机之家 Reading articles on mobile phones Scan QR code
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Given the connection of the system as shown in the figure, try to write a program to implement the following functions:
(1) Write a display program to display "123456".
(2) Write a main program with the following functions: when a key is pressed (0 to 7), the key number is displayed; when no key is pressed, the original display status is maintained.

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Reference address:Functional realization of single-chip microcomputer system composed of 89C51, 74LS273 and 74LS244

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