NRF9160-SICA-R7 datasheet(336/400 Pages) NORDIC

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Peripherals

6.19.8 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 the following table.

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 98: GPIO configuration before enabling peripheral

6.19.9 Registers

Base address Peripheral

Instance

Secure mapping

DMA security

Description

Configuration

0x50008000

0x40008000

UARTE

UARTE0 : S

UARTE0 : NS

Universal asynchronous

receiver/transmitter with

EasyDMA 0

0x50009000

0x40009000

UARTE

UARTE1 : S

UARTE1 : NS

Universal asynchronous

receiver/transmitter with

EasyDMA 1

0x5000A000

0x4000A000

UARTE

UARTE2 : S

UARTE2 : NS

Universal asynchronous

receiver/transmitter with

EasyDMA 2

0x5000B000

0x4000B000

UARTE

UARTE3 : S

UARTE3 : NS

Universal asynchronous

receiver/transmitter with

EasyDMA 3

Table 99: Instances

Offset

Security 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

SUBSCRIBE_STARTRX

0x080

Subscribe configuration for task STARTRX

SUBSCRIBE_STOPRX

0x084

Subscribe configuration for task STOPRX

SUBSCRIBE_STARTTX

0x088

Subscribe configuration for task STARTTX

SUBSCRIBE_STOPTX

0x08C

Subscribe configuration for task STOPTX

SUBSCRIBE_FLUSHRX

0x0AC

Subscribe configuration for task FLUSHRX

EVENTS_CTS

0x100

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

EVENTS_NCTS

0x104

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

4418_1315 v2.0

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