NRF52811-QFAA-R7 datasheet(60/444 Pages) NORDIC

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Power and clock management

Bit number

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

D C

B A

Reset 0x0000FFFF

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Access

Field

Value ID

Value

Description

A-B W S[i]POWER (i=0..1)

Keep RAM section Si of RAMn on or off in System ON mode

C-D W S[i]RETENTION (i=0..1)

Keep retention on RAM section Si when RAM section is

switched off

5.3.9.16 RAM[n].POWERCLR (n=0..7)

Address offset: 0x908 + (n × 0x10)

RAMn power control clear register

When read, this register will return the value of the POWER register.

Bit number

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

D C

B A

Reset 0x0000FFFF

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Access

Field

Value ID

Value

Description

A-B W S[i]POWER (i=0..1)

Keep RAM section Si of RAMn on or off in System ON mode

Off

C-D W S[i]RETENTION (i=0..1)

Keep retention on RAM section Si when RAM section is

switched off

Off

5.3.10 Electrical specification

5.3.10.1 Device startup times

Symbol

Description

Min.

Typ.

Max.

Units

tPOR

Time in Power on Reset after VDD reaches 1.7 V for all

supply voltages and temperatures. Dependent on supply rise

time. 9

tPOR,10us

VDD rise time 10us

tPOR,10ms

VDD rise time 10ms

tPOR,60ms

VDD rise time 60ms

tPINR

If a GPIO pin is configured as reset, the maximum time

taken to pull up the pin and release reset after power on

reset. Dependent on the pin capacitive load (C)10: t=5RC, R

= 13kOhm

tPINR,500nF

C = 500nF

32.5

tPINR,10uF

C = 10uF

650

tR2ON

Time from reset to ON (CPU execute)

tR2ON,NOTCONF

If reset pin not configured

tPOR

tR2ON,CONF

If reset pin configured

tPOR +

tPINR

9 A step increase in supply voltage of 300 mV or more, with rise time of 300 ms or less, within the valid

supply range, may result in a system reset.

10 To decrease maximum time a device could hold in reset, a strong external pullup resistor can be

used.

4454_140 v1.0

NRF52811-QFAA-R7 Datasheet(PDF) 60 Page - Nordic Semiconductor

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