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NRF52820-QDAA-R Datasheet(PDF) 410 Page - Nordic Semiconductor

Part # NRF52820-QDAA-R
Description  nRF52820
PDF  437 Pages
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Manufacturer  NORDIC [Nordic Semiconductor]
Direct Link  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NRF52820-QDAA-R Datasheet(HTML) 410 Page - Nordic Semiconductor

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Peripherals
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
ID
A A A A A A A A A A
Reset 0x00000000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
ID
Access
Field
Value ID
Value
Description
A
RW MAXCNT
Maximum number of bytes to transfer
6.26.13.63 ISOOUT.AMOUNT
Address offset: 0x7A8
Number of bytes transferred in the last transaction
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
ID
A A A A A A A A A A
Reset 0x00000000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
ID
Access
Field
Value ID
Value
Description
A
R
AMOUNT
Number of bytes transferred in the last transaction
6.26.14 Electrical specification
6.26.14.1 USB Electrical Specification
Symbol
Description
Min.
Typ.
Max.
Units
RUSB,PU,ACTIVE
Value of pull-up on D+, bus active (upstream device
transmitting)
1425
2300
3090
Ω
RUSB,PU,IDLE
Value of pull-up on D+, bus idle
900
1200
1575
Ω
tUSB,DETRST
Minimum duration of an SE0 state to be detected as a USB
reset condition
µs
fUSB,CLK
Frequency of local clock, USB active
48
MHz
fUSB,TOL
Accuracy of local clock, USB active33
±1000
ppm
TUSB,JITTER
Jitter on USB local clock, USB active
±1
ns
6.27 WDT — Watchdog timer
A countdown watchdog timer using the low-frequency clock source (LFCLK) offers configurable and robust
protection against application lock-up.
The watchdog timer is started by triggering the START task.
The watchdog can be paused during long CPU sleep periods for low power applications and when the
debugger has halted the CPU. The watchdog is implemented as a down-counter that generates a TIMEOUT
event when it wraps over after counting down to 0. When the watchdog timer is started through the
START task, the watchdog counter is loaded with the value specified in the CRV register. This counter is
also reloaded with the value specified in the CRV register when a reload request is granted.
The watchdog’s timeout period is given by the following equation:
timeout [s] = ( CRV + 1 ) / 32768
33 The local clock can be stopped during USB suspend
4463_156 v1.0
410



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