MRF24XA Datasheet, PDF (224/250 Pages) Texas Instruments – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF Transceiver with Extended Proprietary Features

MRF24XA
REGISTER 9-29: CFOMEAS (CFO MEASUREMENT INDICATION REGISTER)
R/W-00000000
CFOMEAS<7:0>
bit 7
bit 0
Legend: R = Readable bit W = Writable bit
-n = Value at POR
‘1’ = Bit is set
r = Reserved
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-0
CFOMEAS<7:0>: CFO Measurement Field bits
If AFCOVR bit is cleared, then this register is written and valid when RXSFDIF is set with the value of
the carrier frequency offset that was estimated during the acquisition of the packet. The host may use
this value together with the LQI as a preamble quality indication (the LQI is measured over the CFO
compensated payload).
If AFCOVR bit is set, this receiver will compensate the carrier frequency offset. Note that in this case,
the CFO estimation algorithm is disabled, thus ±13 ppm CFO can be tolerated. CFORX has no effect
when AFCOVR is set.
Frequency Offset Unit is: ~1.62 ppm/LSB of the 2.4 GHz carrier. Two’s complement encoding is used.
9.12 Receive Status Vector (RSV)^{(1, 2)}
The received packet can be extended by RSV, that
gives extra information about the link. RSV bits can be
individually enabled.
Note 1: LENGTH field of the packet is not
affected by RSV.
2: LQI, RSSI, CHDR and CFO are the order
of appending the CRC.
DS70005023B-page 224
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