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HCS361 数据表(PDF) 5 Page - Microchip Technology

部件名 HCS361
功能描述  KEELOQ CODE HOPPING ENCODER
PDF  24 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

HCS361 数据表(HTML) 5 Page - Microchip Technology

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HCS361
© 1996 Microchip Technology Inc.
Preliminary
DS40146C-page 5
FIGURE 2-2:
ENCODER OPERATION
3.0
EEPROM MEMORY
ORGANIZATION
The HCS361 contains 192 bits (12 x 16-bit words) of
EEPROM memory (Table 3-1). This EEPROM array is
used
to
store
the
encryption
key
information,
synchronization value, etc. Further descriptions of the
memory array is given in the following sections.
TABLE 3-1
EEPROM MEMORY MAP
3.1
Key_0 - Key_3 (64-Bit Encryption Key)
The 64-bit encryption key is used by the transmitter to
create the encrypted message transmitted to the
receiver. This key is created and programmed at the
time of production using a key generation algorithm.
Inputs to the key generation algorithm are the serial
number for the particular transmitter being used and a
secret manufacturer’s code. While the key generation
algorithm supplied from Microchip is the typical method
used, a user may elect to create their own method of
key generation. This may be done providing that the
decoder is programmed with the same means of creat-
ing the key for decryption purposes. If a seed is used,
the seed will also form part of the input to the key gen-
eration algorithm.
Power Up
Reset and Debounce Delay
(6.5 ms)
Sample Inputs
Update Sync Info
Encrypt With
Load Transmit Register
Buttons
Added
?
All
Buttons
Released
?
(A button has been pressed)
Transmit
Stop
No
Yes
No
Yes
Encryption Key
Complete Code
Word Transmission
WORD
ADDRESS
MNEMONIC
DESCRIPTION
0
KEY_0
64-bit encryption
key (word 0)
1
KEY_1
64-bit encryption
key (word 1)
2
KEY_2
64-bit encryption
key (word 2)
3
KEY_3
64-bit encryption
key (word 3)
4
SYNC_A
16-bit
synchroni-
zation value
5
SYNC_B/SEED_2
16-bit
synchroni-
zation
or
seed
value (word 2)
6
RESERVED
Set to 0000H
7
SEED_0
Seed Value
(word 0)
8
SEED_1
Seed Value
(word 1)
7
SER_0
Device Serial
Number (word 0)
10
SER_1
Device Serial
Number (word 1)
11
CONFIG
Configuration
Word



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