CDNC_I2C_CR_HOLD
sc->cfg_reg_shadow |= CDNC_I2C_CR_HOLD | CDNC_I2C_CR_ACKEN |
sc->cfg_reg_shadow &= ~CDNC_I2C_CR_HOLD;
sc->cfg_reg_shadow |= CDNC_I2C_CR_HOLD | CDNC_I2C_CR_ACKEN |
sc->cfg_reg_shadow &= ~CDNC_I2C_CR_HOLD;