CC2430
Radio : Radio Registers
MDMCTRL0L (0xDF03)
Bit
Name
Reset
R/W
Description
Clear Channel Assessment mode select.
7:6
CCA_MODE[1:0]
11
R/W
00 : Reserved
01 : CCA=1 when RSSI < CCA_THR-CCA_HYST
CCA=0 when RSSI >= CCA_THR
10 : CCA=1 when not receiving a packet
11 : CCA=1 when RSSI < CCA_THR-CCA_HYST and not
receiving a packet
CCA=0 when RSSI >= 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.
5
4
AUTOCRC
AUTOACK
1
0
R/W
R/W
If AUTOACK is enabled, all packets accepted by address
recognition with the acknowledge request flag set and a
valid CRC are acknowledged 12 symbol periods after being
received if MDMCTRL1H.SLOTTED_ACK = 0
.
Acknowledgment is at the beginning of the first backoff slot
more than 12 symbol periods after the end of the received
frame if the MDMCTRL1H.SLOTTED_ACK = 1
0 : AUTOACK disabled
1 : AUTOACK enabled
The number of preamble bytes (2 zero-symbols) to be sent
in TX mode prior to the SYNCWORD. The reset value of
0010 is compliant with IEEE 802.15.4, since the 4th zero
byte is included in the SYNCWORD.
3:0
PREAMBLE_LENGTH[3:0]
0010
R/W
0000 : 1 leading zero bytes (not recommended)
0001 : 2 leading zero bytes (not recommended)
0010 : 3 leading zero bytes (IEEE 802.15.4 compliant)
0011 : 4 leading zero bytes
…
1111 : 16 leading zero bytes
MDMCTRL1H (0xDF04)
Bit
Name
Reset
R/W
Description
SLOTTED_ACK defines the timing of automatically
transmitted acknowledgment frames.
7
SLOTTED_ACK
0
R/W
0 : The acknowledgment frame is transmitted 12 symbol
periods after the incoming frame.
1 : The acknowledgment frame is transmitted between 12
and 30 symbol periods after the incoming frame. The timing
is defined such that there is an integer number of 20-symbol
periods between the received and the transmitted SFDs.
This may be used to transmit slotted acknowledgment
frames in a beacon enabled network.
Reserved
6
5
-
0
1
R/W
R/W
CORR_THR_SFD defines the level at which the
CORR_THR correlation threshold is used to filter out
received frames.
CORR_THR_SFD
0 : Same filtering as CC2420, should be combined with a
CORR_THR of 0x14
1 : More extensive filtering is performed, which will result in
less false frame detections e.g. caused by noise.
Demodulator correlator threshold value, required before
SFD search.
4:0
CORR_THR[4:0]
0x10
R/W
CC2430 Data Sheet (rev. 2.1) SWRS036F
Page 187 of 211
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
