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AT86RF232
? Bit 4 - AACK_DIS_ACK
If this bit is set no acknowledgment frames are transmitted in RX_AACK Extended
Operating Mode, even if requested.
Table 7-32. AACK_DIS_ACK.
Register Bits
AACK_DIS_ACK
Value
0
1
Description
Acknowledgment frames are transmitted
Acknowledgment frames are not transmitted
? Bit 3 - AACK_I_AM_COORD
This register bit has to be set if the node is a PAN coordinator. It is used for frame
filtering in RX_AACK.
Table 7-33. AACK_I_AM_COORD.
Register Bits
AACK_I_AM_COORD
Value
0
1
Description
PAN coordinator addressing is disabled
PAN coordinator addressing is enabled
If AACK_I_AM_COORD = 1 and if only source addressing fields are included in a data
or MAC command frame, the frame shall be accepted only if the device is the PAN
coordinator and the source PAN identifier matches macPANId , for details refer to
IEEE 802.15.4, Section 7.5.6.2 (third-level filter rule six).
? Bit 2:0 - CSMA_SEED_1
Higher 3-bit of CSMA_SEED, bits[10:8]. Seed for random number generation in the
CSMA-CA algorithm.
Table 7-34. CSMA_SEED_1.
Register Bits
CSMA_SEED_1
Value
2
Description
These register bits are the higher 3-bit of the
CSMA_SEED, bits [10:8]. The lower part is in register
0x2D (CSMA_SEED_0), see register CSMA_SEED_0 for
details.
Register 0x2F (CSMA_BE):
The register CSMA_BE contains the back-off exponents for the CSMA-CA algorithm.
Figure 7-24 . Register CSMA_BE.
Bit
0x2F
Read/Write
Reset value
Bit
0x2F
Read/Write
Reset value
7
R/W
0
3
R/W
0
6
R/W
1
2
R/W
0
MAX_BE
MIN_BE
5
R/W
0
1
R/W
1
4
R/W
1
0
R/W
1
CSMA_BE
CSMA_BE
Note:
1.
If MIN_BE = 0 and MAX_BE = 0 the CCA backoff period is always set to zero.
73
8321A – MCU Wireless – 10/11
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