(1) has a number of 8bits symbol X is stored in external RAM unit, calculated as follows the results of Y is also stored in external RAM unit, the programming required. 2 51 series single-chip design of a 24-hour electronic clock, electronic clock, minute, seconds values, respectively, by P0, P1, P2 port output (in the form of compressed BCD code). P3.0 is low, the start time, stop the clock is high.

实验2.doc

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