你说的是Slave internal sub-address? 你看看I2Cm模块datasheet的page 12 of 13中的txCBuf的定义对你有没有帮助?
const BYTE txCBuf[] = { 0x00, // Slave internal sub-address 0
0x12,0x34,0x08, // Seconds and minutes in BCD
// 8:34:12am
0x01, // Day of Week, Monday
0x15,0x03,0x02, // Day-Month-year 15-Mar-02
0x93 }; // Enable clock output
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