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HCS360 数据表(PDF) 8 Page - Microchip Technology

部件名 HCS360
功能描述  KEELOQ짰 Code Hopping Encoder outline and low cost,
PDF  40 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

HCS360 数据表(HTML) 8 Page - Microchip Technology

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HCS360
DS40152F-page 8
© 2011 Microchip Technology Inc.
3.5.5
XSER: EXTENDED SERIAL
NUMBER
If XSER = 0, the four Most Significant bits of the Serial
Number are substituted by S[3:0] and the code word
format is compatible with the HCS200/300/301.
If XSER = 1, the full 32-bit Serial Number [SER_1,
SER_0] is transmitted.
3.5.6
DISCRIMINATION VALUE
While in other KEELOQ encoders its value is user
selectable, the HCS360 uses directly the 8 Least Sig-
nificant bits of the Serial Number as part of the infor-
mation that form the encrypted portion of the
transmission (Figure 3-1).
The discrimination value aids the post-decryption
check on the decoder end. After the receiver has
decrypted a transmission, the discrimination bits are
checked against the encoder Serial Number to verify
that the decryption process was valid.
3.5.7
USRA,B: USER BITS
User bits form part of the discrimination value. The user
bits together with the IND bit can be used to identify the
counter that is used in Independent mode.
FIGURE 3-1:
CODE WORD ORGANIZATION
Note:
Since the button status S[3:0] is used to
detect a Seed transmission, Extended
Serial Number and Secure Learn are
mutually exclusive.
Discrimination Bits
(12 bits)
IO
U
U
S
S
... S
NV
S
S
E
E
... E
DR
R
R
R
R
... R
10
7
6
...
0
Fixed Code Portion of Transmission
Encrypted Portion of Transmission
67 bits
of Data
Transmitted
MSB
LSB
CRC
(2-bit)
VLOW
(1-bit)
Button
Status
(4 bits)
28-bit
Serial Number
Button
Status
(4 bits)
Discrimination
bits
(12 bits)
16-bit
Sync Value
Button Status
(4 bits)
SS
S
S
21
0
3
Fixed Code Portion of Transmission
Encrypted Portion of Transmission
MSB
LSB
CRC
(2-bit)
VLOW
(1-bit)
32-bit
Extended Serial Number
Button
Status
(4 bits)
Discrimination
bits
(12 bits)
16-bit
Sync Value
XSER=1
XSER=0



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