PCR_CLOCK_OFF
bus_space_write_2(iot, ioh, offset, d | PCR_CLOCK_OFF);
bus_space_write_2(iot, ioh, offset, d | PCR_CLOCK_OFF);
bus_space_write_2(iot, ioh, offset, d | PCR_CLOCK_OFF);
bus_space_write_2(iot, ioh, off, PCR_CLOCK_OFF | wren | data);
bus_space_write_2(iot, ioh, off, PCR_CLOCK_OFF | wren | data);
d |= PCR_WREN_ON | PCR_DATA_ON | PCR_CLOCK_OFF;