1. Are there details available on power consumption during various power modes?
>> Please refer to AN-1282 for details
2. Do I need to explicitly disable a module/peripheral when not used in order to save power?
>> No. The modules are automatically clock gated when no accesses are made to them. Please refer to HRM for more details.
3. Can I execute instructions when part is in CORE_SLEEP mode?
>> No instructions can be executed; however, DMA transfers can continue to happen between peripherals and memories.