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HCS370TP Datasheet(PDF) 4 Page - Microchip Technology |
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HCS370TP Datasheet(HTML) 4 Page - Microchip Technology |
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4 / 36 page  HCS370 DS41111D-page 4 Preliminary 2002 Microchip Technology Inc. FIGURE 1-2: BUILDING THE TRANSMITTED CODE WORD (ENCODER) FIGURE 1-3: BASIC OPERATION OF RECEIVER (DECODER) NOTE: Circled numbers indicate the order of execution. Button Press Information EEPROM Array 32 Bits Encrypted Data Serial Number Transmitted Information Crypt Key Sync Counter Serial Number KEELOQ Encryption Algorithm Button Press Information EEPROM Array Manufacturer Code 32 Bits of Encrypted Data Serial Number Received Information Decrypted Synchronization Counter Verify Counter Sync Counter Serial Number KEELOQ Decryption Algorithm 1 3 4 Check for Match 2 Perform Function Indicated by button press 5 Crypt Key B0 B1 |
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