CC2420-RTR1 datasheet(70/92 Pages) TI

70 / 92 page

CC2420

SWRS041B

Page 70 of 89

SECCTRL0 (0x19) - Security Control Register

Bit

Field Name

Reset

R/W

Description

15:10

Reserved, write as 0

RXFIFO_PROTECTION

R/W

Protection enable of the RXFIFO, see description in the RXFIFO

overflow section on page 33. Should be cleared if MAC level

security is not used or is implemented outside CC2420.

SEC_CBC_HEAD

R/W

Defines what to use for the first byte in CBC-MAC (does not

apply to CBC-MAC part of CCM):

0 : Use the first data byte as the first byte into CBC-MAC

1 : Use the length of the data to be authenticated (calculated as

(the packet length field – SEC_TXL – 2) for TX or using SEC_RXL

for RX) as the first byte into CBC-MAC (before the first data

byte).

This bit should be set high for CBC-MAC 802.15.4 inline security.

SEC_SAKEYSEL

R/W

Stand Alone Key select

0 : Key 0 is used

1 : Key 1 is used

SEC_TXKEYSEL

R/W

TX Key select

0 : Key 0 is used

1 : Key 1 is used

SEC_RXKEYSEL

R/W

RX Key select

0 : Key 0 is used

1 : Key 1 is used

4:2

SEC_M[2:0]

R/W

Number of bytes in authentication field for CBC-MAC, encoded

as (M-2)/2

0 : Reserved

1 : 4

2 : 6

3 : 8

4 : 10

5 : 12

6 : 14

7 : 16

1:0

SEC_MODE[1:0]

R/W

Security mode

0 : In-line security is disabled

1 : CBC-MAC

2 : CTR

3 : CCM

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