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HCS360 数据表(PDF) 6 Page - Microchip Technology

部件名 HCS360
功能描述  KEELOQ짰 Code Hopping Encoder
PDF  28 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) 6 Page - Microchip Technology

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HCS360
DS40152D-page 6
 2001 Microchip Technology Inc.
3.2
SYNC_A, SYNC_B
(Synchronization Counter)
This is the 16-bit synchronization value that is used to
create the hopping code for transmission. This value
will be changed after every transmission. A second
synchronization value can be used to stay synchro-
nized with a second receiver.
3.3
SEED_0, SEED_1, and SEED_2
(Seed Word)
This is the three word (48 bits) seed code that will be
transmitted when seed transmission is selected. This
allows the system designer to implement the secure learn
feature or use this fixed code word as part of a different
key generation/tracking process or purely as a fixed code
transmission.
3.4
SER_0, SER_1
(Encoder Serial Number)
SER_0 and SER_1 are the lower and upper words of
the device serial number, respectively. There are 32
bits allocated for the serial number and a selectable
configuration bit determines whether 32 or 28 bits will
be transmitted. The serial number is meant to be
unique for every transmitter.
3.5
CONFIG
(Configuration Word)
The configuration word is a 16-bit word stored in
EEPROM array that is used by the device to store
information used during the encryption process, as well
as
the
status
of
option
configurations.
Further
explanations of each of the bits are described in the
following sections.
3.5.1
LNGRD: LONG GUARD TIME
LNGRD = 1 selects the encoder to extend the guard
time between code words. This can be used to reduce
the average power transmitted over a 100ms window
and thereby transmit a higher peak power.
3.5.2
FAST 1, FAST 0 BAUD RATE SELECTION
FAST 1 and FAST 0 selects the baud rate according to
Table 3-3.
TABLE 3-3:
BAUD RATE SELECTION
TABLE 3-2:
CONFIGURATION WORD
Bit Number
Symbol
Bit Description
0
LNGRD
Long Guard Time
1
FAST 0
Baud Rate Selection
2
FAST 1
Baud Rate Selection
3
NU
Not Used
4
SEED
Seed Transmission enable
5
DELM
Delay mode enable
6
TIMO
Time out enable
7
IND
Independent mode enable
8
USRA0
User bit
9
USRA1
User bit
10
USRB0
User bit
11
USRB1
User bit
12
XSER
Extended serial number
enable
13
TMPSD
Temporary seed transmis-
sion enable
14
MANCH
Manchester/PWM modula-
tion selection
15
OVR
Overflow bit
TE
FAST 1
FAST 0
400
0
0
200
0
1
200
1
0
100
1
1



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