ATSAM3U1C 查看數據表（PDF） - Atmel Corporation

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ATSAM3U1C

AT91SAM ARM-based Flash MCU

Atmel Corporation 

SAM3U Series

5.7 Fast Start-Up

The ATSAM3U4/2/1 device allows the processor to restart in a few microseconds while the pro-

cessor 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 Figure 5-5, is fully asynchronous and provides a fast start-

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.

Figure 5-5. Fast Start-Up Sources

USBEN

usb_wakeup

rtc_alarm

RTCEN

rtt_alarm

RTTEN

WKUP0

WKUP1

High/Low

Level

Detector

High/Low

Level

Detector

FSTT0

FSTT1

fast_restart

WKUP15

High/Low

Level

Detector

FSTT15

23

6430F–ATARM–21-Feb-12

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