25.6.6.8 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 NVM is in power reduction mode indicating that the module can accept a command.

STATUS.PRM is high when NVM is in power reduction mode.