RE_TwiCmdReg
CSR_WRITE_1(sc, RE_TwiCmdReg, CSR_READ_1(sc, RE_TwiCmdReg) | (BIT_7));
CSR_WRITE_1(sc, RE_TwiCmdReg, CSR_READ_1(sc, RE_TwiCmdReg) & ~(BIT_7));