sam3s16 ATMEL Corporation, sam3s16 Datasheet - Page 13

• Manufacturer Part Number: sam3s16
• Description: At91sam Arm-based Flash Mcu
• Manufacturer: ATMEL Corporation

5.5.2
5.5.3
11117AS–ATARM–12-Jul-11
Wait Mode
Sleep Mode
The purpose of the wait mode is to achieve very low power consumption while maintaining the
whole device in a powered state for a startup time of less than 10 µs.
In this mode, the clocks of the core, peripherals and memories are stopped. However, the core,
peripherals and memories power supplies are still powered. From this mode, a fast start up is
available.
This mode is entered via Wait for Event (WFE) instructions with LPM = 1 (Low Power Mode bit in
PMC_FSMR). The Cortex-M3 is able to handle external events or internal events in order to
wake-up the core (WFE). This is done by configuring the external lines WUP0-15 as fast startup
wake-up pins (refer to
can be used to wake up the CPU (exit from WFE).
Entering Wait mode:
Note:
The purpose of the sleep mode is to optimize the power consumption of the device versus the
response time. In this mode, only the core clock is stopped. The peripheral clocks can be
enabled. The current consumption in this mode is application dependent.
This mode is entered via Wait for Interrupt (WFI) or Wait for Event (WFE) instructions with
LPM = 0 in PMC_FSMR.
The processor can be awakened from an interrupt if WFI instruction of the Cortex M3 is used, or
from an event if WFE instruction is used to enter this mode.
• WKUPEN0-15 pins (level transition, configurable debouncing)
• Supply Monitor alarm
• RTC alarm
• RTT alarm
• Select the 4/8/12 MHz fast RC oscillator as Main Clock
• Set the LPM bit in the PMC Fast Startup Mode Register (PMC_FSMR)
• Execute the Wait-For-Event (WFE) instruction of the processor
Internal Main clock resynchronization cycles are necessary between the writing of MOSCRCEN
bit and the effective entry in Wait mode. Depending on the user application, Waiting for
MOSCRCEN bit to be cleared is recommended to ensure that the core will not execute undesired
instructions.
Section 5.7 “Fast
Startup”). RTC or RTT Alarm and USB wake-up events
SAM3S16 Preliminary
13