Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
16
Note:
Restrictions:
- For USB, VDDIO needs to be greater than 3.0V
- For AFE, VDDIN needs to be greater than 2.4V
- For DAC, VDDIN needs to be greater than 2.4V.
- For USB, VDDIO needs to be greater than 3.0V
- For AFE, VDDIN needs to be greater than 2.4V
- For DAC, VDDIN needs to be greater than 2.4V.
Figure 5-2.
Core Externally Supplied
Note:
Restrictions:
- For USB, VDDIO needs to be greater than 3.0V
- For AFE, VDDIN needs to be greater than 2.4V
- For DAC, VDDIN needs to be greater than 2.4V.
- For USB, VDDIO needs to be greater than 3.0V
- For AFE, VDDIN needs to be greater than 2.4V
- For DAC, VDDIN needs to be greater than 2.4V.
5.4
Active Mode
Active mode is the normal running mode with the core clock running from the fast RC oscillator, the main crystal
oscillator or the PLLA. The power management controller can be used to adapt the frequency and to disable the
peripheral clocks.
oscillator or the PLLA. The power management controller can be used to adapt the frequency and to disable the
peripheral clocks.
5.5
Low-power Modes
The SAM4E has the following low-power modes: backup mode, wait mode and sleep mode.
Note:
The Wait For Event instruction (WFE) of the Cortex-M4 core can be used to enter any of the low-power modes, how-
ever, this may add complexity in the design of application state machines. This is due to the fact that the WFE
instruction goes along with an event flag of the Cortex core (cannot be managed by the software application). The
event flag can be set by interrupts, a debug event or an event signal from another processor. Since it is possible for an
interrupt to occur just before the execution of WFE, WFE takes into account events that happened in the past. As a
result, WFE prevents the device from entering wait mode if an interrupt event has occurred.
Atmel has made provision to avoid using the WFE instruction. The workarounds to ease application design are as fol-
lows:
- For backup mode, switch off the voltage regulator and configure the VROFF bit in the Supply Controller Control Reg-
ister (SUPC_CR).
- For wait mode, configure the WAITMODE bit in the PMC Clock Generator Main Oscillator Register of the Power Man-
agement Controller (PMC)
- For sleep mode, use the Wait for Interrupt (WFI) instruction.
ever, this may add complexity in the design of application state machines. This is due to the fact that the WFE
instruction goes along with an event flag of the Cortex core (cannot be managed by the software application). The
event flag can be set by interrupts, a debug event or an event signal from another processor. Since it is possible for an
interrupt to occur just before the execution of WFE, WFE takes into account events that happened in the past. As a
result, WFE prevents the device from entering wait mode if an interrupt event has occurred.
Atmel has made provision to avoid using the WFE instruction. The workarounds to ease application design are as fol-
lows:
- For backup mode, switch off the voltage regulator and configure the VROFF bit in the Supply Controller Control Reg-
ister (SUPC_CR).
- For wait mode, configure the WAITMODE bit in the PMC Clock Generator Main Oscillator Register of the Power Man-
agement Controller (PMC)
- For sleep mode, use the Wait for Interrupt (WFI) instruction.
Complete information is available in
.
5.5.1
Backup Mode
The purpose of backup mode is to achieve the lowest power consumption possible in a system which is performing
periodic wake-ups to perform tasks but not requiring fast startup time. Total current consumption is 1 µA typical
(VDDIO = 1.8 V at 25°C).
periodic wake-ups to perform tasks but not requiring fast startup time. Total current consumption is 1 µA typical
(VDDIO = 1.8 V at 25°C).
Main Supply
(1.62V-3.6V)
(1.62V-3.6V)
Can be the
same supply
same supply
VDDCORE Supply
(1.08V-1.32V)
(1.08V-1.32V)
ADC, DAC, Analog
Comparator Supply
(2.0V-3.6V)
Comparator Supply
(2.0V-3.6V)
ADC, DAC
Analog Comp.
USB
Transceivers
VDDIN
Voltage
Regulator
VDDOUT
VDDCORE
VDDIO
VDDPLL