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HCS410 Datasheet(PDF) 9 Page - Microchip Technology

Part # HCS410
Description  KEELOQ짰 Code Hopping Encoder and Transponder 2-bit CRC, 2-bit queue
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS410 Datasheet(HTML) 9 Page - Microchip Technology

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HCS410
© 2011 Microchip Technology Inc.
DS40158F-page 9
2.2.2
TRANSMISSION DATA MODULE
The Data Modulation Format is selectable between
Pulse Width Modulation (PWM) format and Manchester
encoding. Both formats are preceded by a preamble
and synchronization header, followed by the 69-bits of
data. Manchester encoding has a leading and closing
‘1’ for each code word.
The same code word is continuously sent as long as
the input pins are kept high with a guard time separat-
ing the code words. All of the timing values are in mul-
tiples of a Basic Timing Element (TE), which can be
changed using the baud rate option bits.
FIGURE 2-10: TRANSMISSION FORMAT—MANCH = 0
FIGURE 2-11: TRANSMISSION FORMAT—MANCH = 1
LOGIC "1"
Code Word
Guard
Time
Preamble
Sync
Encrypted
TX Data
Fixed Code
BIT
LOGIC "0"
1
2
3 579
46 8 10
TE
CODE WORD:
TOTAL TRANSMISSION:
Preamble Sync Encrypt
Fixed
Guard
1 CODE WORD
12
4 5
6
Preamble Sync
Encrypt
14 15 16
TE
Data
TE
Guard
Preamble
Sync
Encrypted
Fixed Code
LOGIC "0"
1
2
3
4
TE
CODE WORD:
TOTAL TRANSMISSION:
Sync
Encrypt
Fixed
Guard
1 CODE WORD
12
4
5
6
Preamble
Sync
Encrypt
14 15 16
LOGIC "1"
Start bit
Stop bit
CODE WORD
Preamble
Time
Data
Data
40158F.book Page 9 Wednesday, June 1, 2011 10:36 AM


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