HCS412 Datasheet, PDF (20/44 Pages) Microchip Technology – KEELOQ Code Hopping Encoder and Transponder

HCS412
4.3 IFF Commands
TABLE 4-2: LIST OF AVAILABLE IFF COMMANDS
Opcode
Command
Anticollision Command
(Section 4.3.1)
00000
Read Commands
(Section 4.3.2)
00001
00010
00011
00100
00101
00110
00111
Select HCS412, used if Anticollision enabled
Read configuration word
Read low serial number (least significant 16 bits)
Read high serial number (most significant 16 bits)
Read user EEPROM 0
Read user EEPROM 1
Read user EEPROM 2
Read user EEPROM 3
Program Command
(Section 4.3.5)
01000
Write Commands
(Section 4.3.3)
01001
01010
01011
01100
01101
01110
01111
Program HCS412 EEPROM
Write configuration word
Write low serial number (least significant 16 bits)
Write high serial number (most significant 16 bits)
Write user EEPROM 0
Write user EEPROM 1
Write user EEPROM 2
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
DS41099C-page 20
Preliminary
© 2002 Microchip Technology Inc.