NRF52811-QCAA-R datasheet(383/444 Pages) NORDIC

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Peripherals

2 3

M-2

M-1

4 5 6 7

Figure 146: UART reception

As indicated in occurrence 2 in the figure, the RXDRDY event associated with byte B is generated first after

byte A has been extracted from RXD.

6.27.6 Suspending the UART

The UART can be suspended by triggering the SUSPEND task.

SUSPEND will affect both the UART receiver and the UART transmitter, i.e. the transmitter will stop

transmitting and the receiver will stop receiving. UART transmission and reception can be resumed, after

being suspended, by triggering STARTTX and STARTRX respectively.

Following a SUSPEND task, an ongoing TXD byte transmission will be completed before the UART is

suspended.

When the SUSPEND task is triggered, the UART receiver will behave in the same way as it does when the

STOPRX task is triggered.

6.27.7 Error conditions

An ERROR event, in the form of a framing error, will be generated if a valid stop bit is not detected in a

frame. Another ERROR event, in the form of a break condition, will be generated if the RXD line is held

active low for longer than the length of a data frame. Effectively, a framing error is always generated

before a break condition occurs.

6.27.8 Using the UART without flow control

If flow control is not enabled, the interface will behave as if the CTS and RTS lines are kept active all the

time.

6.27.9 Parity and stop bit configuration

Automatic even parity generation for both transmission and reception can be configured using the register

CONFIG on page 392. See the register description for details.

The amount of stop bits can also be configurated through the register CONFIG on page 392.

6.27.10 Registers

Base address

Peripheral

Instance

Description

Configuration

0x40002000

UART

UART0

Universal asynchronous receiver/

transmitter

Deprecated

Table 113: Instances

4454_140 v1.0

383

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