lpc23xx has 3 sleep modes and one idle mode. `PM_NUM_MODES` must only count the idle modes. In practise, this makes no difference since `mode 3` (IDLE) is the `default` case in `pm_set()` anyway.
lpc23xx has 3 sleep modes and one idle mode. `PM_NUM_MODES` must only count the idle modes. In practise, this makes no difference since `mode 3` (IDLE) is the `default` case in `pm_set()` anyway.