IIC_READ
reg = IIC_READ(sc, I2C_SMSTA);
reg = IIC_READ(sc, I2C_MRXFIFO);
sc->sc_hwrev = IIC_READ(sc, I2C_REV);
IIC_WRITE((sc), (reg), IIC_READ((sc), (reg)) | (bits))
IIC_WRITE((sc), (reg), IIC_READ((sc), (reg)) & ~(bits))
#define RTC_Read (IIC_PCF8583_ADDR | IIC_READ)