CC2420 Datasheet, PDF (64/92 Pages) List of Unclassifed Manufacturers – 2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver

CC2420
MDMCTRL0 (0x11) - Modem Control Register 0
Bit
15:14
13
Field Name
-
RESERVED_FRAME_MODE
12
PAN_COORDINATOR
11
ADR_DECODE
10:8
7:6
CCA_HYST[2:0]
CCA_MODE[1:0]
5
AUTOCRC
4
AUTOACK
3:0
PREAMBLE_LENGTH
[3:0]
Reset
0
0
0
1
2
3
1
0
2
R/W
W0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Reserved, write as 0
Mode for accepting reserved IEE 802.15.4 frame types when
address recognition is enabled (MDMCTRL0.ADR_DECODE = 1).
0 : Reserved frame types (100, 101, 110, 111) are rejected by
address recognition.
1 : Reserved frame types (100, 101, 110, 111) are always
accepted by address recognition. No further address decoding is
done.
When address recognition is disabled (MDMCTRL0.ADR_DECODE =
0), all frames are received and RESERVED_FRAME_MODE is don’t
care.
Should be set high when the device is a PAN Coordinator. Used
for filtering packets with no destination address, as specified in
section 7.5.6.2 in 802.15.4, D18
Hardware Address decode enable.
0 : Address decoding is disabled
1 : Address decoding is enabled
CCA Hysteresis in dB, values 0 through 7 dB
0 : Reserved
1 : CCA=1 when RSSI_VAL < CCA_THR - CCA_HYST
CCA=0 when RSSI_VAL ≥ CCA_THR
2 : CCA=1 when not receiving valid IEEE 802.15.4 data,
CCA=0 otherwise
3 : CCA=1 when RSSI_VAL < CCA_THR - CCA_HYST and not
receiving valid IEEE 802.15.4 data.
CCA=0 when RSSI_VAL ≥ CCA_THR or receiving a packet
In packet mode a CRC-16 (ITU-T) is calculated and is
transmitted after the last data byte in TX. In RX CRC is
calculated and checked for validity.
If AUTOACK is set, all packets accepted by address recognition
with the acknowledge request flag set and a valid CRC are
acknowledged 12 symbol periods after being received.
The number of preamble bytes (2 zero-symbols) to be sent in TX
mode prior to the SYNCWORD, encoded in steps of 2. The reset
value of 2 is compliant with IEEE 802.15.4, since the 4^th zero
byte is included in the SYNCWORD.
0 : 1 leading zero bytes (not recommended)
1 : 2 leading zero bytes (not recommended)
2 : 3 leading zero bytes (IEEE 802.15.4 compliant)
3 : 4 leading zero bytes
…
15 : 16 leading zero bytes
SWRS041B
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