vPB4
reg |= (vPB4 | vPB5);
reg ^= vPB4;
reg |= vPB4;
pmu_write_reg(sc, vBufB, pmu_read_reg(sc, vBufB) | vPB4);
pmu_write_reg(sc, vDirB, (pmu_read_reg(sc, vDirB) | vPB4) & ~vPB3);
reg &= ~vPB4;
reg |= vPB4;