27.5.6.8 Power Reduction Mode

The NVM implements a power reduction mode which cuts its static power consumption. If a command or a AHB access is issued the NVM is woken-up. The AHB access or the command are processed after the NVM wake-up time. The wake-up time can be reduced by enabling the PM fast wake-up feature, this is configured through the PM STDBYCFG register.

The NVM Power Reduction Mode is entered depending on the CTRLA.PRM mode:

• MANUAL:
  • Power Reduction Mode entering conditions:
    • SPRM command
  • Power Reduction Mode leaving conditions:
    • AHB access (read or write)
    • CPRM or any other command
• SEMIAUTO:
  • Power Reduction Mode entering conditions:
    • SPRM command
    • System enters standby mode
    • AHB access completes while in standby mode
    • Any command completes while in standby mode
  • Power Reduction Mode leaving conditions:
    • AHB access (read or write)
    • CPRM or any other command
• FULLAUTO:
  • Power Reduction Mode entering conditions:
    • SPRM command
    • System enters standby mode
    • AHB access completes while in standby mode
    • Any command completes while in standby mode
  • Power Reduction Mode leaving conditions:
    • AHB access (read or write)
    • CPRM or any other command
    • When the system leaves the standby mode

STATUS.READY is high when the NVM is in Power Reduction Mode indicating that the module can accept a command.

STATUS.PRM is high when the NVM is in Power Reduction Mode.