RFHCS362F Datasheet, PDF (6/60 Pages) Microchip Technology – Code Hopping Encoder with UHF ASK/FSK Transmitter

rfHCS362G/362F
FIGURE 1-3:
BUILDING THE TRANSMITTED CODE WORD (ENCODER)
EEPROM Array
Encryption Key
Sync Counter
Serial Number
KEELOQ
Encryption
Algorithm
Button Press
Information
Serial Number
32 Bits
Encrypted Data
Transmitted Information
FIGURE 1-4:
BASIC OPERATION OF RECEIVER (DECODER)
1 Received Information
Button Press
Information
Serial Number
32 Bits of
Encrypted Data
EEPROM Array
Manufacturer Code
2
Check for
Match
Perform Function
5
Indicated by
button press
3
KEELOQ
Decryption
Algorithm
Decrypted
Synchronization
Counter
Serial Number
Sync Counter
Encryption Key
4
Check for
Match
NOTE: Circled numbers indicate the order of execution.
DS41189A-page 6
Preliminary
© 2002 Microchip Technology Inc.