NRF52811-QCAA-R datasheet(53/444 Pages) NORDIC

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Power and clock management

The debug access port (DAP) is not reset following a wake up from System OFF mode if the device is in

Debug Interface mode. See chapter Debug on page 38 for more information.

5.3.6.4 Soft reset

A soft reset is generated when the SYSRESETREQ bit of the Application Interrupt and Reset Control

Refer to ARM documentation for more details.

A soft reset can also be generated via the RESET on page 39 register in the CTRL-AP.

5.3.6.5 Watchdog reset

A Watchdog reset is generated when the watchdog times out.

See chapter WDT — Watchdog timer on page 410 for more information.

5.3.6.6 Brown-out reset

The brown-out reset generator puts the system in reset state if the supply voltage drops below the

brownout reset (BOR) threshold.

Refer to section Power fail comparator on page 61 for more information.

5.3.7 Retained registers

A retained register is a register that will retain its value in System OFF mode and through a reset,

depending on reset source. See individual peripheral chapters for information of which registers are

retained for the various peripherals.

5.3.8 Reset behavior

Reset target

Reset source

CPU

Peripherals GPIO

Debuga

SWJ-DP

RAM

WDT

Retained

registers

RESETREAS

CPU lockup 5

Soft reset

Wakeup from System OFF

mode reset

x 6

x 7

Watchdog reset 8

Pin reset

Brownout reset

Power on reset

Note: The RAM is never reset, but depending on reset source, RAM content may be corrupted.

a All debug components excluding SWJ-DP. See Debug on page 38 chapter for more information about

the different debug components in the system.

5 Reset from CPU lockup is disabled if the device is in debug interface mode. CPU lockup is not possible

in System OFF.

6 The Debug components will not be reset if the device is in debug interface mode.

7 RAM is not reset on wakeup from OFF mode, but depending on settings in the RAM register parts, or

the whole RAM, may not be retained after the device has entered System OFF mode.

8 Watchdog reset is not available in System OFF.

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