HC_CLOCKDIVISOR
WR4(sc, HC_CLOCKDIVISOR, val2);
RD4(sc, HC_CLOCKDIVISOR));
WR4(sc, HC_CLOCKDIVISOR, 0);
WR4(sc, HC_CLOCKDIVISOR, HC_CLOCKDIVISOR_MAXVAL);
val = RD4(sc, HC_CLOCKDIVISOR);