CC2420Z-RTR1 datasheet(65/92 Pages) TI

65 / 92 page

CC2420

SWRS041B

Page 65 of 89

MDMCTRL1 (0x12)– Modem Control Register 1

Bit

Field Name

Reset

R/W

Description

15:11

Reserved, write as 0.

10:6

CORR_THR[4:0]

R/W

Demodulator correlator threshold value, required before SFD

search. Note that on early CC2420 versions the reset value was

DEMOD_AVG_MODE

R/W

Frequency offset average filter behaviour.

0 : Lock frequency offset filter after preamble match

1 : Continuously update frequency offset filter.

MODULATION_MODE

R/W

Set one of two RF modulation modes for RX / TX

0 : IEEE 802.15.4 compliant mode

1 : Reversed phase, non-IEEE compliant (could be used to set

up a system which will not receive 802.15.4 packets)

3:2

TX_MODE[1:0]

R/W

Set test modes for TX

0 : Buffered mode, use TXFIFO (normal operation)

1 : Serial mode, use transmit data on serial interface, infinite

transmission. For lab testing only.

2 : TXFIFO looping ignore underflow in TXFIFO and read cyclic,

infinite transmission. For lab testing only.

3 : Send random data from CRC, infinite transmission. For lab

testing only.

1:0

RX_MODE[1:0]

R/W

Set test mode of RX

0 : Buffered mode, use RXFIFO (normal operation)

1 : Receive serial mode, output received data on pins. Infinite

RX. For lab testing only.

2 : RXFIFO looping ignore overflow in RXFIFO and write cyclic,

infinite reception. For lab testing only.

3 : Reserved

RSSI (0x13) - RSSI and CCA Status and Control Register

Bit

Field Name

Reset

R/W

Description

15:8

CCA_THR[7:0]

-32

R/W

Clear Channel Assessment threshold value, signed number on

2’s complement for comparison with the RSSI.

The unit is 1 dB, offset is the same as for RSSI_VAL. The CCA

signal goes active when the received signal is below this value.

The CCA signal is available on the CCA pin.

The reset value is approximately -77 dBm.

7:0

RSSI_VAL[7:0]

-128

RSSI estimate on a logarithmic scale, signed number on 2’s

complement.

Unit is 1 dB, offset is described in the RSSI / Energy Detection

section on page 48.

The RSSI_VAL value is averaged over 8 symbol periods. The

RSSI_VALID

status bit may be checked to verify that the

receiver has been enabled for at least 8 symbol periods.

The reset value of –128 also indicates that the RSSI_VAL value

is invalid.

CC2420Z-RTR1 数据表(PDF) 65 Page - Texas Instruments

CC2420Z-RTR1 数据表(HTML) 65 Page - Texas Instruments

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