HCS412_11 Datasheet, PDF (20/52 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder and Transponder Burglar alarm systems

HCS412
4.3 IFF Commands
TABLE 4-2: LIST OF AVAILABLE IFF COMMANDS
Opcode
Command
Anticollision Command
(Section 4.3.1)
00000
Select HCS412, used if Anticollision enabled
Read Commands
(Section 4.3.2)
00001
Read configuration word
00010
Read low serial number (least significant 16 bits)
00011
Read high serial number (most significant 16 bits)
00100
Read user EEPROM 0
00101
Read user EEPROM 1
00110
Read user EEPROM 2
00111
Read user EEPROM 3
Program Command
(Section 4.3.5)
01000
Program HCS412 EEPROM
Write Commands
(Section 4.3.3)
01001
Write configuration word
01010
Write low serial number (least significant 16 bits)
01011
Write high serial number (most significant 16 bits)
01100
Write user EEPROM 0
01101
Write user EEPROM 1
01110
Write user EEPROM 2
01111
Write user EEPROM 3
Challenge and Response Commands
(Section 4.3.6)
10000
Challenge and Response using key-1 and IFF algorithm
10001
Challenge and Response using key-1 and HOP algorithm
10100
Challenge and Response using key-2 and IFF algorithm
10101
Challenge and Response using key-2 and HOP algorithm
Request Hopping Code Command
(Section 4.3.7)
11000
Request Hopping Code transmission
Default IFF Command
(Section 4.3.8)
11100
Enable default IFF communication
DS41099D-page 20
© 2011 Microchip Technology Inc.