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AT86RF232
Figure 8-3. IEEE 802.15.4-2006 Frame Control Field (FCF).
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Frame Type
Sec.
Enabled
Frame
Pending
ACK
Request
PAN ID
Comp.
Reserved
Destination
addressing mode
Frame Version
Source
addressing mode
Frame Control Field 2 octets
Bit [2:0] : describes the frame type. Table 8-2 summarizes frame types defined by
IEEE 802.15.4, Section 7.2.1.1.1.
Table 8-2. Frame Control Field – Frame Type Subfield.
Frame Control Field Bit Assignments
Description
Frame Type Value
b 2 b 1 b 0
Value
000
001
010
011
100 – 111
0
1
2
3
4 – 7
Beacon
Data
Acknowledge
MAC command
Reserved
This subfield is used for address filtering by the third level filter rules. By default, only
frame types 0 – 3 pass the third level filter rules, refer to Section 7.2.3.4 . Automatic
address filtering by the Atmel AT86RF232 is enabled when using the RX_AACK mode,
refer to Section 7.2.3 .
However, a reserved frame (frame type value > 3) can be received if register bit
AACK_UPLD_RES_FT (register 0x17, XAH_CTRL_1) is set, for details refer to
Section 7.2.3.3 .
Address filtering is also provided in Basic Operating Mode, refer to Section 7.1 .
Bit 3 : indicates whether security processing applies to this frame.
Bit 4 : is th e “Frame Pending” subfield. This field can be set in an acknowledgment
frame (ACK) in response to a data request MAC command frame. This bit indicates that
the node, which transmitted the ACK, might have more data to send to the node
receiving the ACK.
For acknowledgment frames automatically generated by the AT86RF232, this bit is set
according to the content of register bit AACK_SET_PD in
register 0x2E
(CSMA_SEED_1) if the received frame was a data request MAC command frame.
Bit 5 : forms the “ Acknowledgment R equest” subfield. If this bit is set within a data or
MAC command frame that is not broadcast, the recipient shall acknowledge the
reception of the frame within the time specified by IEEE 802.15.4 (that is within 192μs
for non beacon-enabled networks).
The radio transceiver parses this bit during RX_AACK mode and transmits an
acknowledgment frame if necessary.
In TX_ARET mode this bit indicates if an acknowledgement frame is expected after
transmitting a frame. If this is the case, the receiver waits for the acknowledgment
frame, otherwise the TX_ARET transaction is finished.
Bit 6 : the “PAN ID compression” subfield indicates that in a frame, where both, the
destination and source addresses are present, the PAN-ID of the source address field
81
8321A – MCU Wireless – 10/11
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