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HCS410 датащи(PDF) 24 Page - Microchip Technology

номер детали HCS410
подробное описание детали  KEELOQ짰 Code Hopping Encoder and Transponder 2-bit CRC, 2-bit queue
PDF  46 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS410 датащи(HTML) 24 Page - Microchip Technology

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HCS410
DS40158F-page 24
© 2011 Microchip Technology Inc.
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 por-
tion of the transmission is decrypted using the stored
key. It uses the discrimination bits to determine 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
40158F.book Page 24 Wednesday, June 1, 2011 10:36 AM



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