Is it possible to operate the CPU which can be applied different voltages to VCC1 and VCC2 （VCC1>=VCC2）, turning off VCC1 or VCC2? In addition, which is the CPU and peripheral power supply for the operation, VCC1 or VCC2?
It is impossible to operate the CPU, when VCC1 is OFF and VCC2 is ON, and vice versa. The voltage applied to VCC1 and VCC2 should meet the recommended conditions for the operation. The CPU and peripheral power supply is VCC1.