at91sam7l128 ATMEL Corporation, at91sam7l128 Datasheet - Page 14

• Manufacturer Part Number: at91sam7l128
• Description: At91 Arm Thumb-based Microcontroller
• Manufacturer: ATMEL Corporation

5.3
Figure 5-1.
5.4
14
WKUP15
WKUP0
WKUP1
FWUP
Wake-up Sources
Fast Start-Up
AT91SAM7L128/64 Preliminary
Wake Up Sources
brown_out
rtc_alarm
Falling/Rising
Falling/Rising
Falling/Rising
WKUPT15
WKUPT0
WKUPT1
Detector
Detector
Detector
Detector
Falling
Edge
Edge
Edge
Edge
The wake-up events allow the device to exit from backup mode. When a wake-up event is
detected, the supply controller performs a sequence which automatically reenables the voltage
regulator and the backup SRAM power supply, if it is not already enabled.
The SAM7L128/64 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 16 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 2 MHz Fast RC oscillator, switches the master
clock on this 2 MHz clock and reenables the processor clock, if it is disabled.
BODEN
RTCEN
WKUPEN15
WKUPEN0
WKUPEN1
FWUPEN
WKUPIS0
WKUPIS15
WKUPIS1
SLCK
SLCK
Figure
FWUPDBC
WKUPDBC
Debouncer
Debouncer
5-2, is fully asynchronous and provides a fast start-
WKUPS
FWUP
6257AS–ATARM–28-Feb-08
Core
Supply
Restart