HCS473 Datasheet, PDF (25/68 Pages) Microchip Technology – Code Hopping Encoder and Transponder

HCS473
3.2.3 TRANSPONDER COMMANDS
TABLE 3-5: LIST OF AVAILABLE TRANSPONDER COMMANDS
Command
Option
Description
Select Transponder
(Section 3.2.3.1)
000₂
-
Present Transport Code ⁽¹⁾
(Section 3.2.3.2)
001₂
-
Identify Friend or Foe (IFF) ⁽¹⁾
(Section 3.2.3.3)
010₂
000₂
001₂
010₂
011₂
Read EEPROM ⁽¹⁾
(Section 3.2.3.4)
100₂
000₂
001₂
010₂
011₂
100₂
101₂
110₂
111₂
Write EEPROM ^{(1) (2)}
(Section 3.2.3.5)
101₂
000₂
001₂
010₂
011₂
100₂
101₂
110₂
111₂
Request Hopping Code ⁽¹⁾
(Section 3.2.3.6)
110₂
-
Select HCS473, used to isolate communication to a single HCS473
Used to gain write access to the device EEPROM memory locations
32-bit IFF using the Transponder Key
16-bit IFF using the Transponder Key
32-bit IFF using the Encoder Key
16-bit IFF using the Encoder Key
Read 16-bit User EEPROM 0
Read 16-bit User EEPROM 1
Read 16-bit User EEPROM 2
Read 16-bit User EEPROM 3
Read Most Significant 16 bits of the Serial Number
Read Least Significant 16 bits of the Serial Number
Read 16-bit Device Identifier #1 (12-bit Vehicle ID #1 and 4-bit Token ID #1)
Read 16-bit Device Identifier #2 (12-bit Vehicle ID #2 and 4-bit Token ID #1)
Write 16-bit User EEPROM 0
Write 16-bit User EEPROM 1
Write 16-bit User EEPROM 2
Write 16-bit User EEPROM 3
Write Most Significant 16 bits of the Serial Number
Write Least Significant 16 bits of the Serial Number
Write 16-bit Device Identifier #1 (12-bit Vehicle ID #1 and 4-bit Token ID #1)
Write 16-bit Device Identifier #2 (12-bit Vehicle ID #2 and 4-bit Token ID #1)
Request Hopping Code transmission
Anticollision OFF
(Section 3.2.3.7)
111₂
-
Temporarily bypass a HCS473’s anticollision requirements.
Note 1: Command must be preceded by successful Select Transponder or Anticollision Off sequence if anticolli-
sion is enabled.
2: A successful Present Transport Code sequence must first occur to gain write access.
 2002 Microchip Technology Inc.
Preliminary
DS40035C-page 23