NRF52810-QFAA-R datasheet(431/483 Pages) NORDIC

431 / 483 page

Peripherals

6.24.6 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.

6.24.7 Slave mode pin configuration

The SCL and SDA signals associated with the TWI slave are mapped to physical pins according to the

configuration specified in the PSEL.SCL and PSEL.SDA registers respectively.

The PSEL.SCL and PSEL.SDA registers and their configurations are only used as long as the TWI slave is

enabled, and retained only as long as the device is in ON mode. When the peripheral is disabled, the pins

will behave as regular GPIOs, and use the configuration in their respective OUT bit field and PIN_CNF[n]

To secure correct signal levels on the pins used by the TWI slave when the system is in OFF mode, and

when the TWI slave is disabled, these pins must be configured in the GPIO peripheral as described in GPIO

configuration before enabling peripheral on page 431.

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

unpredictable behavior.

TWI slave signal

TWI slave pin

Direction

Output value

Drive strength

SCL

As specified in PSEL.SCL

Input

Not applicable

S0D1

SDA

As specified in PSEL.SDA

Input

Not applicable

S0D1

Table 90: GPIO configuration before enabling peripheral

6.24.8 Registers

Base address

Peripheral

Instance

Description

Configuration

0x40003000

TWIS

TWIS0

Two-wire interface slave

Table 91: Instances

Offset

Description

TASKS_STOP

0x014

Stop TWI transaction

TASKS_SUSPEND

0x01C

Suspend TWI transaction

TASKS_RESUME

0x020

Resume TWI transaction

TASKS_PREPARERX

0x030

Prepare the TWI slave to respond to a write command

TASKS_PREPARETX

0x034

Prepare the TWI slave to respond to a read command

EVENTS_STOPPED

0x104

TWI stopped

EVENTS_ERROR

0x124

TWI error

EVENTS_RXSTARTED

0x14C

Receive sequence started

EVENTS_TXSTARTED

0x150

Transmit sequence started

EVENTS_WRITE

0x164

Write command received

EVENTS_READ

0x168

Read command received

SHORTS

0x200

Shortcut register

INTEN

0x300

Enable or disable interrupt

INTENSET

0x304

Enable interrupt

INTENCLR

0x308

Disable interrupt

ERRORSRC

0x4D0

Error source

4430_161 v1.0

431

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