CC2420Z-RTR1 datasheet(64/92 Pages) TI

64 / 92 page

CC2420

SWRS041B

Page 64 of 89

MDMCTRL0 (0x11) - Modem Control Register 0

Bit

Field Name

Reset

R/W

Description

15:14

Reserved, write as 0

RESERVED_FRAME_MODE

R/W

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 =

), all frames are received and RESERVED_FRAME_MODE is don’t

care.

PAN_COORDINATOR

R/W

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

ADR_DECODE

R/W

Hardware Address decode enable.

0 : Address decoding is disabled

1 : Address decoding is enabled

10:8

CCA_HYST[2:0]

R/W

CCA Hysteresis in dB, values 0 through 7 dB

7:6

CCA_MODE[1:0]

R/W

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

AUTOCRC

R/W

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.

AUTOACK

R/W

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.

3:0

PREAMBLE_LENGTH

[3:0]

R/W

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

CC2420Z-RTR1 数据表(PDF) 64 Page - Texas Instruments

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