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NRF52820-QDAA-R Datasheet(PDF) 380 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) 380 Page - Nordic Semiconductor

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Peripherals
An ENDEPOUT[0] event will be generated when the data has been transferred from the USBD peripheral
to memory. The software can then either prepare to receive the next data transaction by repeating the
above sequence, or initiate the status stage through the EP0STATUS task. Until then, further incoming OUT
+DATA transactions get a NAK response by the device.
SETUP
8 bytes
ACK
USB host
USB device
OUT
DATA (m)
ACK
IN
NAK
IN
DATA (0)
ACK
Setup stage
Data stage
Status stage
OUT
DATA (n)
NAK
OUT
DATA (n)
ACK
IN
NAK
Events & tasks
Software
Figure 141: Control write transfer
SETUP
8 bytes
ACK
USB host
USB device
IN
NAK
IN
DATA (0)
ACK
Setup stage
Status stage
Events & tasks
Software
Figure 142: Control write no data transfer
6.26.10 Bulk and interrupt transactions
The USBD peripheral implements seven pairs of bulk/interrupt endpoints.
The bulk/interrupt endpoints have a fixed USB endpoint number, summarized in the following table.
Bulk endpoint #
USB IN endpoint
USB OUT endpoint
[1]
0x81
0x01
[2]
0x82
0x02
[3]
0x83
0x03
[4]
0x84
0x04
[5]
0x85
0x05
[6]
0x86
0x06
[7]
0x87
0x07
Table 108: Bulk/interrupt endpoint numbering
A bulk/interrupt transaction consists of a single data stage. Two consecutive, successful transactions are
distinguished through alternating leading process ID (PID): DATA0 follows DATA1, DATA1 follows DATA0,
etc. A repeated transaction is detected by re-using the same PID as previous transaction, i.e DATA0 follows
DATA0, or DATA1 follows DATA1.
The USBD controller automatically toggles DATA0/DATA1 PIDs for every bulk/interrupt transaction.
4463_156 v1.0
380



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