SAM4L_14 Datasheet, PDF (61/176 Pages) ATMEL Corporation – Technology for Ultra-low Power Consumption

ATSAM4L8/L4/L2
• Set the clock frequency to be supported in both power configurations.
• Set the high speed read mode of the FLASH to be supported in both power scaling
configurations
– Only relevant when entering or exiting BPM.PMCON.PS=2
• Configure the BPM.PMCON.PS field to the new power configuration.
• Set the BPM.PMCON.PSCREQ bit to one.
• Disable all the interrupts except the PM WCAUSE interrupt and enable only the PSOK
asynchronous event in the AWEN register of PM.
• Execute the WFI instruction.
• WAIT for PM interrupt.
The new power configuration is reached when the system is waken up by the PM interrupt
thanks to the PSOK event.
By default, all features are available in all Power Scaling modes. However some specific fea-
tures are not available in PS1 (BPM.PMCON.PS=1) mode :
– USB
– DFLL
– PLL
– Programming/Erasing in Flash
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