NRF52820-QDAA-R datasheet(166/437 Pages) NORDIC

166 / 437 page

Peripherals

6.12.5 Radio states

Tasks and events are used to control the operating state of RADIO.

RADIO can enter the states described in the following table.

State

Description

DISABLED

No operations are going on inside the RADIO and the power consumption is at a minimum

RXRU

RADIO is ramping up and preparing for reception

RXIDLE

RADIO is ready for reception to start

Reception has been started and the addresses enabled in the RXADDRESSES register are being monitored

TXRU

RADIO is ramping up and preparing for transmission

TXIDLE

RADIO is ready for transmission to start

RADIO is transmitting a packet

RXDISABLE

RADIO is disabling the receiver

TXDISABLE

RADIO is disabling the transmitter

Table 54: RADIO state diagram

A state diagram showing an overview of RADIO is shown in the following figure.

DISABLED

TXRU

TXIDLE

Ramp-up

complete

/ READY

START

Packet sent / END

Address sent

/ ADDRESS

Payload sent

[payload length >=0]

/ PAYLOAD

RXRU

RXIDLE

Ramp-up

complete

/ READY

START

Packet received / END

Address received

[Address match]

/ ADDRESS

Payload received

[payload length >=0]

/ PAYLOAD

RXDISABLE

/ DISABLED

TXDISABLE

/ DISABLED

STOP

Last bit sent / PHYEND

TXEN

RXEN

DISABLE

TXEN

Last bit received / PHYEND

Figure 52: Radio states

This figure shows how the tasks and events relate to the RADIO's operation. The RADIO does not prevent

a task from being triggered from the wrong state. If a task is triggered from the wrong state, for example

if the RXEN task is triggered from the RXDISABLE state, this may lead to incorrect behavior. The PAYLOAD

event is always generated even if the payload is zero.

The END to START shortcut should not be used with IEEE 802.15.4 250 kbps mode. Use the PHYEND to

START shortcut instead.

The END to START shortcut should not be used with Long Range (125 kbps and 500 kbps) Bluetooth® Low

Energy modes. Use the PHYEND to START shortcut instead.

6.12.6 Transmit sequence

Before the RADIO is able to transmit a packet, it must first ramp-up in TX mode. See TXRU in Radio states

on page 166 and Transmit sequence on page 167. A TXRU ramp-up sequence is initiated when the

TXEN task is triggered. After the RADIO has successfully ramped up it will generate the READY event

4463_156 v1.0

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NRF52820-QDAA-R Datasheet(PDF) 166 Page - Nordic Semiconductor

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