使用AT89S52单片机，在keil c51环境下，控制RTC芯片DS1302实现实时时钟功能。此工程经过实际应用证明，有效。GPIO管脚模拟i2c总线方式读写DS1302的片内寄存器，可以实现万年历时间的读取和设定，注释丰富，代码很容易移植到其他系统中使用-Use AT89S52 Singlechip in keil c51 environment, control RTC chip DS1302 real-time clock function. This works through the practical application of proven and effective. GPIO pin analog i2c bus DS1302 way the chip to read and write registers, can achieve calendar time to read and settings, Notes rich, code can easily migrate to other systems used in