在线翻译

Abstract The design is based on the the at89s52 control of practical electronic clock, with real-time adjustable time, you can freely set the regular time, which time adjustment button, the corresponding diode will be lit in the arrival at the regular time to remind the timer time has been reached. Microcontroller comes timer to seconds of time 更多：https://www.bmcx.com/ , the use of peripheral 74hc164 for data transmission to the 74hc138 Choice of digital tube, and then display the data. The system structure of the external circuit is simple, low cost, easy to implement. Keywords: at89s52 electronic clock 74hc164 74hc138

Summary AT89S52 control design is a practical electronic clock, with real-time adjustable time, you can freely set time, time to use keys to adjust, arrived in the scheduled time of corresponding diode will stay lit to remind the time has arrived. Using single chip computer's timer, to second timing 更多：https://www.bmcx.com/ , the use of external data transfer 74HC164, 74HC138 digital control of elections, thus data is displayed. Peripheral circuit of the system structure is simple, low cost, easy to implement. Keywords: AT89S52 electronic clock 74HC164 74HC138

The this design is based on the practical AT89S52 control electric clock, with real-time adjustable time, can be set free time time which use the button to realize the adjustment of the time, arrived at the time of the corresponding diode after time will ChangLiang to remind timing time has arrived. By single chip microcomputer can own timer,For the second time, the use of peripheral 74 HC164 data transmission 更多：https://www.bmcx.com/ , 74 HC138 digital tube of a selected, and then, the data show. The system structure is peripheral circuit is simple, low cost, easy to realize. keywords: 74 HC164 74 HC138 AT89S52 electric clock

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