下面是I2C作为从机的初始化：主机对从机操作，从机没有应答
// Step1: Config Own Address (work as a slave device)
I2caRegs.I2COAR = 0x0050;
// Step2: Config Module Clock
// I2CCLK = SYSCLK/(I2CPSC+1)
#if (CPU_FRQ_40MHZ||CPU_FRQ_50MHZ)
I2caRegs.I2CPSC.all = 4; // Prescaler - need 7-12 Mhz on module clk
#endif
#if (CPU_FRQ_60MHZ)
I2caRegs.I2CPSC.all = 6; // Prescaler - need 7-12 Mhz on module clk
#endif
// Step3: Config I2C Bus SCLK clock
// Step4: Config I2C Interrupt Source
// Reference: User Guide Page26; Enable = 1, Disable = 0
I2caRegs.I2CIER.bit.AAS = 1; // Addressed as slave, poll I2CSTR.AAS
I2caRegs.I2CIER.bit.ARBL = 0; // Arbitration lost, poll I2CSTR.ARBL
I2caRegs.I2CIER.bit.ARDY = 0; // Register access ready, poll I2CSTR.ARDY
I2caRegs.I2CIER.bit.NACK = 0; // No-acknowLEDgement, poll I2CSTR.NACK
I2caRegs.I2CIER.bit.RRDY = 0; // [USED IN NON-FIFO MODE ONLY]Receive data ready, poll I2CSTR.RRDY
I2caRegs.I2CIER.bit.SCD = 0; // Stop condition detected, poll I2CSTR.SCD
I2caRegs.I2CIER.bit.XRDY = 0; // [USED IN NON-FIFO MODE ONLY]Transmit data ready, poll I2CSTR.XRDY
I2caRegs.I2CMDR.all = 0x0020; // [RECOMMENDED IN NON-INIT OPERATION] 0000 0010 0010 0000
