hcs473 Microchip Technology Inc., hcs473 Datasheet - Page 25

• Manufacturer Part Number: hcs473
• Description: Code Hopping Encoder And Transponder
• Manufacturer: Microchip Technology Inc.

3.2.3
TABLE 3-5:
 2002 Microchip Technology Inc.
Select Transponder
(Section 3.2.3.1)
Present Transport Code
(Section 3.2.3.2)
Identify Friend or Foe (IFF)
Read EEPROM
(Section 3.2.3.4)
Write EEPROM
(Section 3.2.3.5)
Request Hopping Code
(Section 3.2.3.6)
Anticollision OFF
(Section 3.2.3.7)
Note 1: Command must be preceded by successful Select Transponder or Anticollision Off sequence if anticolli-
(Section 3.2.3.3)
Command
2: A successful Present Transport Code sequence must first occur to gain write access.
000
001
010
100
101
110
111
sion is enabled.
TRANSPONDER COMMANDS
2
2
2
2
2
2
2
(1)
(1) (2)
LIST OF AVAILABLE TRANSPONDER COMMANDS
Option
(1)
(1)
000
001
010
000
001
010
100
101
000
001
010
100
101
011
011
110
111
011
110
111
-
-
-
-
(1)
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
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
Temporarily bypass a HCS473’s anticollision requirements.
Preliminary
Description
HCS473
DS40035C-page 23