Arduino uno + DS1302 simple time acquisition and serial port printing

Arduino UNO + DS1302 Simply get the time and print through serial port

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• DS1302 modular
  

DS1302 brief introduction

DS1302 yes DALLAS Trickle charging clock chip launched by the company , It contains a real-time clock / Calendar and 31 Byte static RAM , Communicate with MCU through simple serial interface . Real time clock / The calendar circuit provides seconds 、 branch 、 when 、 Japan 、 Zhou 、 month 、 Information for the year , The number of days per month and leap year can be adjusted automatically . The clock operation can be realized through AM/PM The instruction decides to adopt 24 or 12 Hour format .DS1302 And MCU can simply use synchronous serial communication , Only three port lines are needed ：（1）RST Reset （2）I/O cable （3）SCLK The serial clock . The clock /RAM The reading of / Write data in one byte or up to 31 Byte character group communication .DS1302 The power consumption is very low during operation, and the power is less than when maintaining data and clock information 1mW

DS1302 Main performance indicators ：

* The real-time clock can calculate 2100 Seconds years ago 、 branch 、 when 、 Japan 、 week 、 month 、 Years of ability , And the ability to adjust in leap years
* 31 8 Bit temporary data storage RAM
* Serial I/O The port mode minimizes the number of pins
* Wide range of operating voltage 2.0 5.5V
* Working current 2.0V when , Less than 300nA
* read / Write clock or RAM There are two transmission modes for data: single byte transmission and multi byte transmission character group mode
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