QUICC_REG_SCC_TODR
quicc_write2(bas, QUICC_REG_SCC_TODR(unit), val0);
val0 = quicc_read2(bas, QUICC_REG_SCC_TODR(unit));
quicc_write2(bas, QUICC_REG_SCC_TODR(unit), ~val0);
val1 = quicc_read2(bas, QUICC_REG_SCC_TODR(unit));