CC2420 Chipcon AS, CC2420 Datasheet - Page 68

• Manufacturer Part Number: CC2420
• Description: 2.4 GHz RF Transceiver for IEEE 802.15.4 and ZigBee
• Manufacturer: Chipcon AS

SECCTRL0 (0x19) - Security Control Register
15:10
9
8
7
6
5
4:2
1:0
Chipcon AS SmartRF ® CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
Bit
Field Name
-
RXFIFO_PROTECTION
SEC_CBC_HEAD
SEC_SAKEYSEL
SEC_TXKEYSEL
SEC_RXKEYSEL
SEC_M[2:0]
SEC_MODE[1:0]
Reset
0
1
1
1
1
0
1
0
R/W
W0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SmartRF
Description
Reserved, write as 0
Protection enable of the RXFIFO, see description in the RXFIFO
overflow section on page 29. Should be cleared if MAC level
security is not used or is implemented outside CC2420.
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.
Stand Alone Key select
0 : Key 0 is used
1 : Key 1 is used
TX Key select
0 : Key 0 is used
1 : Key 1 is used
RX Key select
0 : Key 0 is used
1 : Key 1 is used
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
Security mode
0 : In-line security is disabled
1 : CBC-MAC
2 : CTR
3 : CCM
®
CC2420
Page 68 of 85