SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7
9.5.4 Power Management Requirements
The module implements the following power-reducing functionalities (see Figure 9-8):
- Voltage Off: The module logic VDD is turned off. Pump and bank is kept in deep sleep. This mode requires a reset and software configuration to become active.
- Power Off: This is the same state as Voltage Off with the only difference that module logic has retention on all registers. From Power Off mode, the module can become active without any software configurations.
- Deep Standby: Internal circuits are partly powered down. No internal configuration is required to become active, but there is some delay due to voltage ramping and so on.
- Idle Reading: Use advanced power reduction features in the Pump and Bank to save power when no active reading is going on. In this mode, switching to Active Read is done without any reduced read latency.
- Reading: FLASH is actively reading without any power reduction.
Methods for changing power mode:
- Leaving Voltage Off or Power Off can only be done from the system power management. Voltage Off is like initial power on. Power Off requires a restore of retention, and internal sequencers must power up and configure the bank and charge pump.
- Leaving Deep Standby can start from the following:
- PRCM
- By writing a register in the MMR
- By starting a read access to the FLASH
- Switching between Idle Reading and Reading is done automatically when a read has ended. The switching can be disabled by a register setting.
- Switching from Idle Reading to any other mode is done by setting up a register with the target power mode. After some time without read accesses, the module enters or prepares the selected mode. The last step to achieve Power Off or Voltage Off is done by the system power management.
Figure 9-8 FLASH Power States