This mode is for applications needing ultra-low
power applications. The device can either be powered using two rails (1.8V and 1.2V)
or with three rails (3.3V, 1.8V and 1.2V).
Figure 7-3 Power Optimized Mode Power Management (Left: 1.8V I/O Topology, Right: 3.3V I/O Topology)