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HCS410 датащи(PDF) 25 Page - Microchip Technology

номер детали HCS410
подробное описание детали  KEELOQ CODE HOPPING ENCODER AND TRANSPONDER
PDF  36 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS410 датащи(HTML) 25 Page - Microchip Technology

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HCS410
© 1997 Microchip Technology Inc.
Preliminary
DS40158C-page 25
4.3
CH Mode Decoder Operation
In a typical decoder operation (Figure 4-4), the key
generation on the decoder side is done by taking the
serial number from a transmission and combining that
with the manufacturer’s code to create the same
encoder key that is stored in the HCS410. Once the
encoder key is obtained, the rest of the transmission
can be decrypted. The decoder waits for a transmission
and
immediately
checks
the
serial
number
to
determine if it is a learned transmitter. If it is, the code
hopping portion of the transmission is decrypted using
the stored key. It uses the discrimination bits to deter-
mine if the decryption was valid. If everything up to this
point is valid, the synchronization counter value
is evaluated.
FIGURE 4-4:
TYPICAL CH MODE
DECODER OPERATION
?
Transmission
Received
Does
Serial Number
Match
?
Decrypt Transmission
Is
Decryption
Valid
?
Is
Counter
Within 16
?
Is
Counter
Within 32K
?
Update
Counter
Execute
Command
Save Counter
in Temp Location
Start
No
No
No
No
Yes
Yes
Yes
Yes
Yes
and
No
No



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