SAM4S 查看數據表（PDF） - Atmel Corporation

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SAM4S

AT91SAM ARM-based Flash MCU

Atmel Corporation 

SAM4S Series [Preliminary]

5.7 Fast Startup

The SAM4S 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 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 MHz clock and reenables the processor clock.

Figure 5-5. Fast Start-Up Sources

FSTT0

WKUP0

WKUP1

WKUP15

FSTP0

FSTT1

FSTP1

FSTT15

FSTP15 RTTAL

fast_restart

RTT Alarm

RTCAL

RTC Alarm

USBAL

USB Alarm

25

11100BS–ATARM–31-Jul-12

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