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is omitted. In RX_AACK mode, this bit is evaluated by the address filter logic of the
Atmel AT86RF232. This subfield was previously named “Intra - PAN”.
Bit [11:10] : the “Destination Addressing M ode” subfield describes the format of the
destination address of the frame. The values of the address modes are summarized in
Table 8-3 , according to IEEE 802.15.4:
Table 8-3. Frame Control Field – Destination and Source Addressing Mode.
Frame Control Field Bit Assignments
Description
Addressing Mode
b 11 b 10
b 15 b 14
Value
00
01
10
11
0
1
2
3
PAN identifier and address fields are not present
Reserved
Address field contains a 16-bit short address
Address field contains a 64-bit extended address
If the destination address mode is either two or three (that is if the destination address
is present), it always consists of a 16-bit PAN-ID first, followed by either the 16-bit or
64-bit address as described by the mode.
Bit [13:12] : the “Frame V ersion” subfield specifies the version number corresponding to
the frame. These register bits are reserved in IEEE 802.15.4-2003.
This subfield shall be
set to zero
to indicate a frame compatible with
IEEE 802.15.4-2003 and one to indicate an IEEE 802.15.4-2006 frame. All other
subfield values shall be reserved for future use.
RX_AACK register bits AACK_FVN_MODE (register 0x2E, CSMA_SEED_1) controls
the behavior of frame acknowledgements. This register determines if, depending on the
Frame Version Number, a frame is acknowledged or not. This is necessary for
backward compatibility to IEEE 802.15.4-2003 and for future use. Even if frame version
numbers two and three are reserved, it can be handled by the radio transceiver, for
details refer to Section 7.2.7 .
See IEEE 802.15.4-2006, Section 7.2.3 for details on frame compatibility.
Table 8-4. Frame Control Field – Frame Version Subfield.
Frame Control Field Bit Assignments
Description
Frame Version
b 13 b 12
Value
00
01
10
11
0
1
2
3
Frames are compatible with IEEE 802.15.4-2003
Frames are compatible with IEEE 802.15.4-2006
Reserved
Reserved
Bit [15:14] : the “Source Addressing Mode” subfield, with similar meaning as
“Destination Addressing Mode” , see Table 8-3 .
The subfields of the FCF (Bits 0 – 2, 3, 6, 10 – 15) affect the address filter logic of the
AT86RF232 while operating in RX_AACK operation, see Section 7.2.3 .
82
AT86RF232
8321A – MCU Wireless – 10/11
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