NRF52811-QCAA-R datasheet(397/444 Pages) NORDIC

397 / 444 page

Peripherals

6.28.8 Pin configuration

The different signals RXD, CTS (Clear To Send, active low), RTS (Request To Send, active low), and TXD

associated with the UARTE are mapped to physical pins according to the configuration specified in the

PSEL.RXD, PSEL.CTS, PSEL.RTS, and PSEL.TXD registers respectively.

The PSEL.RXD, PSEL.CTS, PSEL.RTS, and PSEL.TXD registers and their configurations are only used as long

as the UARTE is enabled, and retained only for the duration the device is in ON mode. PSEL.RXD, PSEL.RTS,

PSEL.RTS and PSEL.TXD must only be configured when the UARTE is disabled.

To secure correct signal levels on the pins by the UARTE when the system is in OFF mode, the pins must be

configured in the GPIO peripheral as described in GPIO configuration before enabling peripheral on page

397.

Only one peripheral can be assigned to drive a particular GPIO pin at a time. Failing to do so may result in

unpredictable behavior.

UARTE signal

UARTE pin

Direction

Output value

RXD

As specified in PSEL.RXD

Input

Not applicable

CTS

As specified in PSEL.CTS

Input

Not applicable

RTS

As specified in PSEL.RTS

Output

TXD

As specified in PSEL.TXD

Output

Table 115: GPIO configuration before enabling peripheral

6.28.9 Registers

Base address

Peripheral

Instance

Description

Configuration

0x40002000

UARTE

UARTE0

Universal asynchronous receiver/

transmitter with EasyDMA

Table 116: Instances

Offset

Description

TASKS_STARTRX

0x000

Start UART receiver

TASKS_STOPRX

0x004

Stop UART receiver

TASKS_STARTTX

0x008

Start UART transmitter

TASKS_STOPTX

0x00C

Stop UART transmitter

TASKS_FLUSHRX

0x02C

Flush RX FIFO into RX buffer

EVENTS_CTS

0x100

CTS is activated (set low). Clear To Send.

EVENTS_NCTS

0x104

CTS is deactivated (set high). Not Clear To Send.

EVENTS_RXDRDY

0x108

Data received in RXD (but potentially not yet transferred to Data RAM)

EVENTS_ENDRX

0x110

Receive buffer is filled up

EVENTS_TXDRDY

0x11C

Data sent from TXD

EVENTS_ENDTX

0x120

Last TX byte transmitted

EVENTS_ERROR

0x124

Error detected

EVENTS_RXTO

0x144

Receiver timeout

EVENTS_RXSTARTED

0x14C

UART receiver has started

EVENTS_TXSTARTED

0x150

UART transmitter has started

EVENTS_TXSTOPPED

0x158

Transmitter stopped

SHORTS

0x200

Shortcuts between local events and tasks

INTEN

0x300

Enable or disable interrupt

INTENSET

0x304

Enable interrupt

INTENCLR

0x308

Disable interrupt

4454_140 v1.0

397

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