EM2420 ETC [List of Unclassifed Manufacturers], EM2420 Datasheet - Page 66

• Manufacturer Part Number: EM2420
• Description: 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver
• Manufacturer: ETC [List of Unclassifed Manufacturers]

MDMCTRL0 (0x11) - Modem Control Register 0
15:14
13
12
11
10:8
7:6
5
4
3:0
Ember Part Number: 120-0049-000C
Bit
Field Name
-
RESERVED_FRAME_MODE
PAN_COORDINATOR
ADR_DECODE
CCA_HYST[2:0]
CCA_MODE[1:0]
AUTOCRC
AUTOACK
PREAMBLE_LENGTH
[3:0]
Reset
0
0
0
1
2
3
1
0
2
EM2420 Datasheet
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 (
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 (
0
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
2 : CCA=1 when not receiving valid IEEE 802.15.4 data,
3 : CCA=1 when RSSI_VAL < CCA_THR - CCA_HYST andnot
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
ack’ed 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
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
), all frames are received and
CCA=0 when RSSI_VAL ≥ CCA_THR
CCA=0 otherwise
receiving valid IEEE 802.15.4 data.
CCA=0 when RSSI_VAL ≥ CCA_THR or receiving a packet
EM2420
RESERVED_FRAME_MODE
MDMCTRL0.ADR_DECODE = 1
MDMCTRL0.ADR_DECODE =
Page 66 of 89
th
is don’t
zero
).