Force-OFF mode is only applicable for the network core.
The register interface RESET — Reset control is used by the application core to force the network core to Force-OFF mode. In this mode, the network core is stopped in order to achieve the lowest power consumption possible. When the network core is in Force-OFF mode, only the application core can release the mode, causing the network core to wake up and start the CPU again.
Before the application core sets the network core to Force-OFF mode, it is recommended that the network core is in IDLE state, as defined by the following:
- All peripherals are stopped
- Additional voltage on the VREGRADIO supply is canceled using VREQCTRL — Voltage request control
- The CPU is in IDLE state, meaning it is running the WFI or WFE instruction
When the network core wakes up from Force-OFF mode, it is reset. For more details, see Network core reset behavior.
Several RAM sections can be retained in Force-OFF mode depending on the RAM retention settings in the peripheral VMC — Volatile memory controller.