以MPS430F149为硬件平台，利用I/O口模拟I2C总线协议，对日精的时钟芯片S35390A_C做了初始化子程序、读时钟子程序、写时间子程序、脉冲为1赫兹输出子程序。-To MPS430F149 for the hardware platform, the use of I/O port simulation I2C bus protocol on-chip clock nissei S35390A_C done initialization subroutine, read subrout