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ATSAM4S-XPLD
26
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
5.7
Fast Start-up
The SAM4S 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 (WKUP0 to 15 + USB + RTC + RTT).
occur upon detection of a low level on one of the 19 wake-up inputs (WKUP0 to 15 + USB + RTC + RTT).
, 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 master clock on this 4 MHz clock and reenables the processor clock.
4/8/12 MHz Fast RC oscillator, switches the master clock on this 4 MHz clock and reenables the processor clock.
Figure 5-5.
Fast Start-up Sources
fast_restart
WKUP15
FSTT15
FSTP15
WKUP1
FSTT1
FSTP1
WKUP0
FSTT0
FSTP0
RTTAL
RTCAL
USBAL
RTT Alarm
RTC Alarm
USB Alarm