AT32UC3L064_1 ATMEL [ATMEL Corporation], AT32UC3L064_1 Datasheet - Page 160

• Manufacturer Part Number: AT32UC3L064_1
• Description: AVR32 32-bit Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

13.6.4.3
13.6.5
13.6.6
32099A–AVR32–06/09
Divided PB Clocks
Reset Controller
Leaving Shutdown sleep mode
Exiting the Shutdown sleep mode can be done using the events described in
page
Table 13-4.
When a wake-up event occurs, the regulator is turned-on again and the device will wait for
VDDCORE power to be valid again before starting again.
The bit SLEEP is then set in the RCAUSE register. This allows software running on the device to
distinguish between the first power-up and a wake-up from Shutdown mode.
The clock generator in the Power Manager provides divided PBx clocks for use by peripherals
that require a prescaled PBx clock. This is described in the documentation for the relevant
modules.
The divided clocks are directly maskable, and are stopped in sleep modes where the PBx clocks
are stopped.
The Reset Controller collects the various reset sources in the system and generates hard and
soft resets for the digital logic.
The device contains a Power-On Detector, which keeps the system reset until power is stable.
This eliminates the need for external reset circuitry to guarantee stable operation when powering
up the device.
It is also possible to reset the device by asserting the RESET_N pin. This pin has an internal
pull-up, and does not need to be driven externally when negated.
these and other reset sources supported by the Reset Controller.
Source
PA11 (WAKE_N)
RESET_N
AST
160.
Events That Can Wake-Up The Device From Shutdown Mode
Pulling-down RESET_N pin will wake-up the device
The device is kept under reset until RESET_N is tied high
again
32KHz Crystal oscillator must be set-up to use alternate
pinout (XIN32_2 and XOUT32_2) See SCIF Chapter
AST must be configured to use the clock from the 32KHz
crystal oscillator
AST must be configured to allow alarm,periodic or
overflow wake-up
How
Pulling-down PA11 will wake-up the device
Table 13-5 on page 161
AT32UC3L
Table 13-4 on
lists
160