Introduction - If you have any usage issues, please Google them yourself
The use of regular counters, design of an electronic clock, minutes and seconds from left to right is displayed. There are two ways to realize one is in the interruption of proceedings counting, when the minutes and seconds count, to the display buffer. Another procedure is interrupted every second to clear a bit variable, while the main program by monitoring the change of variable-bit-per-second of time to know.
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数字钟打铃器程序 .pdf