Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
589
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
The system enters wait mode either by setting the WAITMODE bit in CKGR_MOR, or by executing the
WaitForEvent (WFE) instruction of the processor while the LPM bit is at 1 in PMC_FSMR. Immediately after setting
the WAITMODE bit or using the WFE instruction, wait for the MCKRDY bit to be set in PMC_SR.
WaitForEvent (WFE) instruction of the processor while the LPM bit is at 1 in PMC_FSMR. Immediately after setting
the WAITMODE bit or using the WFE instruction, wait for the MCKRDY bit to be set in PMC_SR.
A fast startup is enabled upon the detection of a programmed level on one of the 16 wake-up inputs (WKUP) or
upon an active alarm from the RTC, RTT and USB Controller. The polarity of the 16 wake-up inputs is
programmable by writing the PMC Fast Startup Polarity Register (PMC_FSPR).
upon an active alarm from the RTC, RTT and USB Controller. The polarity of the 16 wake-up inputs is
programmable by writing the PMC Fast Startup Polarity Register (PMC_FSPR).
The fast startup circuitry, as shown in
, is fully asynchronous and provides a fast startup signal to the
Power Management Controller. As soon as the fast startup signal is asserted, the embedded 4/8/12 MHz fast RC
oscillator restarts automatically.
oscillator restarts automatically.
When entering wait mode, the embedded Flash can be placed in one of the low-power modes (deep-power-down
or standby) depending on the configuration of the FLPM field in the PMC_FSMR. The FLPM field can be
programmed at anytime and its value will be applied to the next wait mode period.
or standby) depending on the configuration of the FLPM field in the PMC_FSMR. The FLPM field can be
programmed at anytime and its value will be applied to the next wait mode period.
The power consumption reduction is optimal when configuring 1 (deep-power-down mode) in field FLPM. If 0 is
programmed (standby mode), the power consumption is slightly higher than in deep-power-down mode.
programmed (standby mode), the power consumption is slightly higher than in deep-power-down mode.
When programming 2 in field FLPM, the wait mode Flash power consumption is equivalent to that of the active
mode when there is no read access on the Flash.
mode when there is no read access on the Flash.
Figure 30-4.
Fast Startup Circuitry
Each wake-up input pin and alarm can be enabled to generate a fast startup event by setting the corresponding bit
in PMC_FSMR.
in PMC_FSMR.
The user interface does not provide any status for fast startup, but the user can easily recover this information by
reading the PIO Controller and the status registers of the RTC, RTT and USB Controller.
reading the PIO Controller and the status registers of the RTC, RTT and USB Controller.
fast_restart
WKUP15
FSTT15
FSTP15
WKUP1
FSTT1
FSTP1
WKUP0
FSTT0
FSTP0
RTTAL
RTCAL
USBAL
RTT Alarm
RTC Alarm
USB Alarm