NRF52810-QFAA-R datasheet(442/483 Pages) NORDIC

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Peripherals

0x20000000

0x20000001

Data RAM

0x20000002

0x20000003

0x20000010

0x20000011

0x20000012

0x20000013

0x20000020

0x20000021

0x20000022

0x20000023

0x20000004

0x20000014

0x20000024

Figure 123: UARTE reception

The UARTE receiver is stopped by triggering the STOPRX task. An RXTO event is generated when the UARTE

has stopped. The UARTE will make sure that an impending ENDRX event will be generated before the RXTO

event is generated. This means that the UARTE will guarantee that no ENDRX event will be generated after

RXTO, unless the UARTE is restarted or a FLUSHRX command is issued after the RXTO event is generated.

Important: If the ENDRX event has not already been generated when the UARTE receiver has come

to a stop, which implies that all pending content in the RX FIFO has been moved to the RX buffer,

the UARTE will generate the ENDRX event explicitly even though the RX buffer is not full. In this

scenario the ENDRX event will be generated before the RXTO event is generated.

To be able to know how many bytes have actually been received into the RX buffer, the CPU can read the

RXD.AMOUNT register following the ENDRX event or the RXTO event.

The UARTE is able to receive up to four bytes after the STOPRX task has been triggered as long as these are

sent in succession immediately after the RTS signal is deactivated. This is possible because after the RTS is

deactivated the UARTE is able to receive bytes for an extended period equal to the time it takes to send 4

bytes on the configured baud rate.

After the RXTO event is generated the internal RX FIFO may still contain data, and to move this data to

RAM the FLUSHRX task must be triggered. To make sure that this data does not overwrite data in the RX

buffer, the RX buffer should be emptied or the RXD.PTR should be updated before the FLUSHRX task is

triggered. To make sure that all data in the RX FIFO is moved to the RX buffer, the RXD.MAXCNT register

must be set to RXD.MAXCNT > 4, see UARTE reception with forced stop via STOPRX on page 443. The

UARTE will generate the ENDRX event after completing the FLUSHRX task even if the RX FIFO was empty or

if the RX buffer does not get filled up. To be able to know how many bytes have actually been received into

the RX buffer in this case, the CPU can read the RXD.AMOUNT register following the ENDRX event.

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NRF52810-QFAA-R Datasheet(PDF) 442 Page - Nordic Semiconductor

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