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NRF52820-QDAA-R Datasheet(PDF) 254 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) 254 Page - Nordic Semiconductor

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Peripherals
If several AHB bus masters try to access the same AHB slave at the same time, AHB bus congestion might
occur. Data loss will occur in this event.
6.16.4 Low power
When putting the system in low power and the peripheral is not needed, lowest possible power
consumption is achieved by stopping, and then disabling the peripheral.
The STOP task may not be always needed (the peripheral might already be stopped), but if it is sent,
software shall wait until the STOPPED event was received as a response before disabling the peripheral
through the ENABLE register.
6.16.5 Registers
Base address
Peripheral
Instance
Description
Configuration
0x40003000
SPIM
SPIM0
SPI master 0
0x40004000
SPIM
SPIM1
SPI master 1
Table 78: Instances
Register
Offset
Description
TASKS_START
0x010
Start SPI transaction
TASKS_STOP
0x014
Stop SPI transaction
TASKS_SUSPEND
0x01C
Suspend SPI transaction
TASKS_RESUME
0x020
Resume SPI transaction
EVENTS_STOPPED
0x104
SPI transaction has stopped
EVENTS_ENDRX
0x110
End of RXD buffer reached
EVENTS_END
0x118
End of RXD buffer and TXD buffer reached
EVENTS_ENDTX
0x120
End of TXD buffer reached
EVENTS_STARTED
0x14C
Transaction started
SHORTS
0x200
Shortcuts between local events and tasks
INTENSET
0x304
Enable interrupt
INTENCLR
0x308
Disable interrupt
ENABLE
0x500
Enable SPIM
PSEL.SCK
0x508
Pin select for SCK
PSEL.MOSI
0x50C
Pin select for MOSI signal
PSEL.MISO
0x510
Pin select for MISO signal
FREQUENCY
0x524
SPI frequency. Accuracy depends on the HFCLK source selected.
RXD.PTR
0x534
Data pointer
RXD.MAXCNT
0x538
Maximum number of bytes in receive buffer
RXD.AMOUNT
0x53C
Number of bytes transferred in the last transaction
RXD.LIST
0x540
EasyDMA list type
TXD.PTR
0x544
Data pointer
TXD.MAXCNT
0x548
Number of bytes in transmit buffer
TXD.AMOUNT
0x54C
Number of bytes transferred in the last transaction
TXD.LIST
0x550
EasyDMA list type
CONFIG
0x554
Configuration register
ORC
0x5C0
Byte transmitted after TXD.MAXCNT bytes have been transmitted in the case when
RXD.MAXCNT is greater than TXD.MAXCNT
Table 79: Register overview
6.16.5.1 TASKS_START
Address offset: 0x010
4463_156 v1.0
254



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