NRF52811-QCAA-R datasheet(183/444 Pages) NORDIC

183 / 444 page

Peripherals

See CRCCNF register for more information.

The CRC polynomial is configurable as illustrated in the following figure, where bit 0 in the CRCPOLY

information.

Packet

(Clocked in serially)

Xn-1

Figure 61: CRC generation of an n bit CRC

The figure shows that the CRC is calculated by feeding the packet serially through the CRC generator.

Before the packet is clocked through the CRC generator, the CRC generator's latches b0 through bn will

be initialized with a predefined value specified in the CRCINIT register. After the whole packet has been

clocked through the CRC generator, b0 through bn will hold the resulting CRC. This value will be used by the

RADIO during both transmission and reception. Latches b0 through bn are not available to be read by the

CPU at any time. However, a received CRC can be read by the CPU via the RXCRC register.

The length (n) of the CRC is configurable, see CRCCNF for more information.

Once the entire packet, including the CRC, has been received and no errors were detected, the RADIO

generates a CRCOK event. If CRC errors were detected, a CRCERROR event is generated.

The status of the CRC check can be read from the CRCSTATUS register after a packet has been received.

6.14.5 Radio states

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

The RADIO can enter the states described the table below.

State

Description

DISABLED

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

RXRU

The RADIO is ramping up and preparing for reception

RXIDLE

The RADIO is ready for reception to start

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

TXRU

The RADIO is ramping up and preparing for transmission

TXIDLE

The RADIO is ready for transmission to start

The RADIO is transmitting a packet

RXDISABLE

The RADIO is disabling the receiver

TXDISABLE

The RADIO is disabling the transmitter

Table 60: RADIO state diagram

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

4454_140 v1.0

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