NRF52811-QCAA-R datasheet(331/444 Pages) NORDIC

331 / 444 page

Peripherals

To generate a repeated start after a read sequence, a second start task must be triggered instead of the

STOP task, that is, STARTRX or STARTTX. This start task must be triggered before the last byte is extracted

from RXD to ensure that the TWI master sends a NACK back to the slave before generating the repeated

start condition.

6.23.7 Low power

When putting the system in low power and the peripheral is not needed, lowest possible power

consumption is achieved by stopping, and then disabling the peripheral.

The STOP task may not be always needed (the peripheral might already be stopped), but if it is sent,

software shall wait until the STOPPED event was received as a response before disabling the peripheral

through the ENABLE register.

6.23.8 Registers

Base address

Peripheral

Instance

Description

Configuration

0x40003000

TWI

TWI0

Two-wire interface master

Deprecated

Table 99: Instances

Offset

Description

TASKS_STARTRX

0x000

Start TWI receive sequence

TASKS_STARTTX

0x008

Start TWI transmit sequence

TASKS_STOP

0x014

Stop TWI transaction

TASKS_SUSPEND

0x01C

Suspend TWI transaction

TASKS_RESUME

0x020

Resume TWI transaction

EVENTS_STOPPED

0x104

TWI stopped

EVENTS_RXDREADY

0x108

TWI RXD byte received

EVENTS_TXDSENT

0x11C

TWI TXD byte sent

EVENTS_ERROR

0x124

TWI error

EVENTS_BB

0x138

TWI byte boundary, generated before each byte that is sent or received

EVENTS_SUSPENDED

0x148

TWI entered the suspended state

SHORTS

0x200

Shortcuts between local events and tasks

INTENSET

0x304

Enable interrupt

INTENCLR

0x308

Disable interrupt

ERRORSRC

0x4C4

Error source

ENABLE

0x500

Enable TWI

PSEL.SCL

0x508

Pin select for SCL

PSEL.SDA

0x50C

Pin select for SDA

RXD

0x518

RXD register

TXD

0x51C

TXD register

FREQUENCY

0x524

TWI frequency. Accuracy depends on the HFCLK source selected.

ADDRESS

0x588

Address used in the TWI transfer

Table 100: Register overview

6.23.8.1 TASKS_STARTRX

Address offset: 0x000

Start TWI receive sequence

4454_140 v1.0

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