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HCS515-I-P Datasheet(PDF) 6 Page - Microchip Technology

Part # HCS515-I-P
Description  KEELOQ Code Hopping Decoder
Download  32 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS515-I-P Datasheet(HTML) 6 Page - Microchip Technology

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HCS515
DS40183D-page 6
© 2002 Microchip Technology Inc.
3.2
Validation of Codes
The decoder waits for a transmission and checks the
serial number to determine if it is a learned transmitter.
If it is, it takes the code hopping portion of the transmis-
sion and decrypts it, using the encoder decryption key.
It uses the discrimination value to determine if the
decryption was valid. If everything up to this point is
valid, the synchronization counter value is evaluated.
3.3
Validation Steps
Validation consists of the following steps:
1.
Search EEPROM to find the Serial Number
Check Value Match
2.
Decrypt the Hopping Code
3.
Compare the 10 bits of the discrimination value
with the lower 10 bits of serial number
4.
Check if the synchronization counter value falls
within the first synchronization window.
5.
Check if the synchronization counter value falls
within the second synchronization window.
6.
If a valid transmission is found, update the
synchronization counter, else use the next
transmitter block, and repeat the tests.
FIGURE 3-2:
DECODER OPERATION
Transmission
Received?
Does
Ser # Check Val
Match?
Decrypt Transmission
Is
decryption
valid?
Is
Counter within
16?
Is
Counter within
16K?
Update
Counter
Execute
Command
Save Counter
in Temp Location
Start
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
and


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