MICROCHIP 32-bit Answer: For most MCUs, including the 32-bit PIC32 MCUs, you have to have more than one bank of RAM in order to be able to turn unused RAM off. Since the PIC32s currently all have a single bank of RAM, it's not currently possible to turn off any RAM in a PIC32.
16-bit Answer: Microchip does have the ability to selectively power the RAM in sleep with their 16-bit MCUs. This is the difference between the LV-Sleep Mode and the Deep Sleep Mode. This saves a lot of power. LV-Sleep is roughly 300 nA, while Deep Sleep is 10nA with RAM off.
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