REG_CLOCK_CONTROL
PUT16(ss, REG_CLOCK_CONTROL, 0);
PUT16(ss, REG_CLOCK_CONTROL,
val = GET16(ss, REG_CLOCK_CONTROL);
PUT16(ss, REG_CLOCK_CONTROL, val |
PUT16(ss, REG_CLOCK_CONTROL, CLOCK_CONTROL_INT_CLOCK_EN);