SAM3A8C Atmel Corporation, SAM3A8C Datasheet - Page 85
SAM3A8C
Manufacturer Part Number
SAM3A8C
Description
Manufacturer
Atmel Corporation
- Current page: 85 of 1465
- Download datasheet (26Mb)
11.7.4
11.8
11.8.1
11.8.1.1
11.8.1.2
11.8.1.3
11.8.2
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Power management
Lockup
Entering sleep mode
Wakeup from sleep mode
Wait for interrupt
Wait for event
Sleep-on-exit
The processor enters a lockup state if a hard fault occurs when executing the hard fault han-
dlers. When the processor is in lockup state it does not execute any instructions. The processor
remains in lockup state until:
The Cortex-M3 processor sleep modes reduce power consumption:
The SLEEPDEEP bit of the SCR selects which sleep mode is used, see
ter” on page
Modes” in the PMC section of the datasheet.
This section describes the mechanisms for entering sleep mode, and the conditions for waking
up from sleep mode.
This section describes the mechanisms software can use to put the processor into sleep mode.
The system can generate spurious wakeup events, for example a debug operation wakes up the
processor. Therefore software must be able to put the processor back into sleep mode after
such an event. A program might have an idle loop to put the processor back to sleep mode.
The wait for interrupt instruction, WFI, causes immediate entry to sleep mode. When the proces-
sor executes a WFI instruction it stops executing instructions and enters sleep mode. See
on page 151
The wait for event instruction, WFE, causes entry to sleep mode conditional on the value of an
one-bit event register. When the processor executes a WFE instruction, it checks this register:
See
If the SLEEPONEXIT bit of the SCR is set to 1, when the processor completes the execution of
an exception handler it returns to Thread mode and immediately enters sleep mode. Use this
mechanism in applications that only require the processor to run when an exception occurs.
The conditions for the processor to wakeup depend on the mechanism that cause it to enter
sleep mode.
• it is reset
• Backup Mode
• Wait Mode
• Sleep Mode
• if the register is 0 the processor stops executing instructions and enters sleep mode
• if the register is 1 the processor clears the register to 0 and continues executing instructions
without entering sleep mode.
“WFE” on page 150
174. For more information about the behavior of the sleep modes see “Low Power
for more information.
for more information.
“System Control Regis-
SAM3X/A
SAM3X/A
“WFI”
85
85
Related parts for SAM3A8C
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
AT91SAM ARM-based Flash MCU
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
High-performance EE PLD
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
8-bit Flash Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
2-Wire Serial EEPROM
Manufacturer:
ATMEL Corporation
Datasheet: