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? Bit 3:1 - MAX_CSMA_RETRIES
Number of retries in TX_ARET mode to repeat the CSMA-CA procedure before the
transaction gets cancelled.
Table 7-27. MAX_CSMA_RETRIES.
Register Bits
Value
Description
MAX_CSMA_RETRIES
0
1
2
3
4
5
7
(1)
(1)
(1)
(1)
(1)
(1)
(3)
no retries
One retry
Two retries
Three retries
Four retries
Five retries
Immediate frame transmission without performing CSMA-
CA
Notes: 1.
2.
3.
MAX_CSMA_RETRIES specifies the number of retries in TX_ARET mode to
repeat the CSMA-CA procedure before the transaction gets cancelled. According
to IEEE 802.15.4 the valid range of MAX_CSMA_RETRIES is [5, 4, …, 0].
MAX_CSMA_RETRIES = 6 is reserved.
A value of MAX_CSMA_RETRIES = 7 initiates an immediate frame transmission
without performing CSMA-CA.
? Bit 0 - SLOTTED_OPERATION
For RX_AACK mode, the register bit SLOTTED_OPERATION determines, if the
transceiver will require a time base for slotted operation.
Table 7-28. SLOTTED_OPERATION.
Register Bits
SLOTTED_OPERATION
Value
0
1
Description
The radio transceiver operates in unslotted mode. An
acknowledgment frame is automatically sent if requested.
The transmission of an acknowledgement frame has to be
controlled by the microcontroller.
Using RX_AACK mode in networks operating in beacon or slotted mode, refer to
IEEE 802.15.4-2006, Section 5.5.1, register bit SLOTTED_OPERATION indicates that
acknowledgement frames are to be sent on back-off slot boundaries (slotted
acknowledgement), refer to Section 7.2.3.5 .
If this register bit is set the acknowledgement frame transmission has to be initiated by
the microcontroller using the rising edge of pin 11 (SLP_TR). This waiting state is
signaled in register bits TRAC_STATUS (register 0x02, TRX_STATE) with value
SUCCESS_WAIT_FOR_ACK.
70
AT86RF232
8321A – MCU Wireless – 10/11
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