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7.2.2 Configuration
The use of the Extended Operating Mode is based on Basic Operating Mode
functionality. Only features beyond the basic radio transceiver functionality are
described in the following sections. For details on the Basic Operating Mode refer to
Section 7.1 .
When using the RX_AACK or TX_ARET modes, the following registers needs to be
configured.
RX_AACK configuration steps:
? Short address, PAN-ID and IEEE address
? Configure RX_AACK properties
registers 0x20 – 0x2B
registers 0x2C, 0x2E
o
o
o
o
Handling of Frame Version Subfield
Handling of Pending Data Indicator
Characterize as PAN coordinator
Handling of Slotted Acknowledgement
? Additional Frame Filtering Properties
registers 0x17, 0x2E
o
o
o
Promiscuous Mode
Enable or disable automatic ACK generation
Handling of reserved frame types
The addresses for the address match algorithm are to be stored in the appropriate
address registers. Additional control of the RX_AACK mode is done with register 0x17
(XAH_CTRL_1) and register 0x2E (CSMA_SEED_1).
As long as a short address has not been set, only broadcast frames and frames
matching the IEEE address can be received.
Configuration examples for different device operating modes and handling of various
frame types can be found in Section 7.2.3.1 .
TX_ARET configuration steps:
? Leave register bit TX_AUTO_CRC_ON = 1
? Configure CSMA-CA
register 0x04, TRX_CTRL_1
o
o
o
o
MAX_FRAME_RETRIES
MAX_CSMA_RETRIES
CSMA_SEED
MAX_BE, MIN_BE
register 0x2C, XAH_CTRL_0
register 0x2C, XAH_CTRL_0
registers 0x2D, 0x2E
register 0x2F, CSMA_BE
? Configure CCA (see Section 8.5 )
MAX_FRAME_RETRIES (register 0x2C, XAH_CTRL_0) defines the maximum number
of frame retransmissions.
The register bits MAX_CSMA_RETRIES (register 0x2C, XAH_CTRL_0) configure the
number of CSMA-CA retries after a busy channel is detected.
The register bits CSMA_SEED (registers 0x2D, 0x2E) define a random seed for the
back-off-time random-number generator in the Atmel AT86RF232.
The register bits MAX_BE and MIN_BE (register 0x2F, CSMA_BE) set the maximum
and minimum CSMA back-off exponent (see [1]), respectively.
46
AT86RF232
8321A – MCU Wireless – 10/11
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