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NRF52820-QDAA-R Datasheet(PDF) 163 Page - Nordic Semiconductor |
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NRF52820-QDAA-R Datasheet(HTML) 163 Page - Nordic Semiconductor |
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163 / 437 page  Peripherals RADIO 2.4 GHz receiver 2.4 GHz transmitter RSSI EasyDMA Dewhitening Whitening IFS control unit CRC CRC Address match Bit counter RAM L S0 Payload S1 L S0 S1 PACKETPTR Packet disassembler Packet assembler Device address match Packet synch Payload MAXLEN ANT1 Figure 46: RADIO block diagram The RADIO includes a device address match unit and an interframe spacing control unit that can be utilized to simplify address whitelisting and interframe spacing respectively in Bluetooth® low energy and similar applications. The RADIO also includes a received signal strength indicator (RSSI) and a bit counter. The bit counter generates events when a preconfigured number of bits are sent or received by the RADIO. 6.12.1 Packet configuration A RADIO packet contains the fields PREAMBLE, ADDRESS, S0, LENGTH, S1, PAYLOAD, and CRC. For Long Range (125 kbps and 500 kbps) Bluetooth® Low Energy modes, fields CI, TERM1, and TERM2 are also included. The content of a RADIO packet is illustrated in the figures below. The RADIO sends the fields in the packet according to the order illustrated in the figures, starting on the left. BASE PREFIX S0 LENGTH S1 CRC PAYLOAD LSByte MSByte LSByte ADDRESS 0x55 0xAA PREAMBLE 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 Figure 47: On-air packet layout BASE PREFIX S0 LENGTH S1 CRC PAYLOAD LSByte MSByte LSByte ADDRESS PREAMBLE TERM 2 TERM1 CI Figure 48: On-air packet layout for Long Range (125 kbps and 500 kbps) Bluetooth® Low Energy modes Not shown in the figures is the static payload add-on (the length of which is defined in PCNF1.STATLEN, and which is 0 bytes in a standard BLE packet). The static payload add-on is sent between PAYLOAD and CRC fields. The RADIO sends the different fields in the packet in the order they are illustrated above, from left to right. PREAMBLE is sent with least significant bit first on air. The size of the PREAMBLE depends on the mode selected in the MODE register: • The PREAMBLE is one byte for MODE = Ble_1Mbit as well as all Nordic proprietary operating modes (MODE = Nrf_1Mbit and MODE = Nrf_2Mbit), and PCNF0.PLEN has to be set accordingly. If the first bit of the ADDRESS is 0, the preamble will be set to 0xAA. Otherwise the PREAMBLE will be set to 0x55. 4463_156 v1.0 163 |
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