REG3
CSR_WRITE_1(sc, REG3, (CSR_READ_1(sc, REG3) & 0x3f));
CSR_WRITE_1(sc, REG3, CSR_READ_1(sc, REG3));
CSR_WRITE_1(sc, REG3, CSR_READ_1(sc, REG3));
CSR_WRITE_1(sc, REG3, CSR_READ_1(sc, REG3));
current = CSR_READ_1(sc, REG3);