ATSAM3S ATMEL [ATMEL Corporation], ATSAM3S Datasheet - Page 23

• Manufacturer Part Number: ATSAM3S
• Description: AT91 ARM Cortex M3-based Processor
• Manufacturer: ATMEL [ATMEL Corporation]

5.7
6500AS–ATARM–11-Dec-09
Fast Startup
The SAM3S allows the processor to restart in a few microseconds while the processor is in wait
mode or in sleep mode. A fast start up can occur upon detection of a low level on one of the 19
wake-up inputs (WKUP0 to 15 + SM + RTC + RTT).
The fast restart circuitry, as shown in
up signal to the Power Management Controller. As soon as the fast start-up signal is asserted,
the PMC automatically restarts the embedded 4 MHz fast RC oscillator, switches the master
clock on this 4MHz clock and reenables the processor clock.
Figure 5-5.
WKUP15
WKUP0
WKUP1
Fast Start-Up Sources
usb_wakeup
Falling/Rising
Falling/Rising
Falling/Rising
rtc_alarm
rtt_alarm
Detector
Detector
Detector
Edge
Edge
Edge
USBEN
RTTEN
RTCEN
Figure
FSTT15
FSTT0
FSTT1
5-5, is fully asynchronous and provides a fast start-
SAM3S Summary
fast_restart
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