SD2068 是一种具有标准IIC 接口的实时时钟芯片,CPU 可使用该接口通过5 位地址寻址来读写片内32 字节寄存器的数据(包括时间寄存器、报警寄存器、控制寄存器、通用SRAM 寄存器)。-SD2068 is a standard IIC interface with real-time clock chip, CPU can use the interface addressing the 5-bit address to read and write on-chip 32-byte register data (including time register, the alarm registers, control registers, general-purpose SRAM register) .