SAM3A ATMEL [ATMEL Corporation], SAM3A Datasheet - Page 26

• Manufacturer Part Number: SAM3A
• Description: AT91SAM ARM-based Flash MCU
• Manufacturer: ATMEL [ATMEL Corporation]

5.7
Figure 5-4.
28
28
Fast Start-Up
SAM3X/A
SAM3X/A
Fast Start-Up Sources
WKUP15
WKUP0
WKUP1
The SAM3X/A series allows the processor to restart in a few microseconds while the processor
is in wait mode. A fast start up can occur upon detection of a low level on one of the 19 wake-up
inputs.
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 4/8/12 MHz fast RC oscillator, switches the mas-
ter clock on this 4/8/12 MHz clock and reenables the processor clock.
usb_wakeup
rtc_alarm
rtt_alarm
High/Low
High/Low
High/Low
Detector
Detector
Detector
Level
Level
Level
USBEN
RTCEN
RTTEN
FSTT15
FSTT0
FSTT1
Figure
5-4, is fully asynchronous and provides a fast start-
fast_restart
11057BS–ATARM–13-Jul-12
11057BS–ATARM–13-Jul-12