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HCS412I Datasheet(PDF) 33 Page - Microchip Technology

Part # HCS412I
Description  KEELOQ Code Hopping Encoder and Transponder
PDF  44 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS412I Datasheet(HTML) 33 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
Preliminary
DS41099C-page 33
HCS412
FIGURE 6-3:
SYNCHRONIZATION WINDOW
FIGURE 6-4:
BASIC OPERATION OF RECEIVER (DECODER)
Note:
Circled numbers indicate sequence of events.
Blocked
Entire Window
rotates to eliminate
use of previously
used codes
Single Operation
Window
Window
(32K Codes)
(16 Codes)
Double Operation
(resynchronization)
Window
(32K Codes)
Stored
Synchronization
Counter Value
Button Press
Information
EEPROM Array
Manufacturer Code
32 Bits of
Encrypted Data
Serial Number
Received Information
Decrypted
Synchronization
Counter
Check for
Match
Sync Counter
Serial Number
KEELOQ
Decryption
Algorithm
1
3
4
Check for
Match
2
Perform Function
Indicated by
button press
5
Crypt Key



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