HCS360-/P MICROCHIP [Microchip Technology], HCS360-/P Datasheet - Page 6

• Manufacturer Part Number: HCS360-/P
• Manufacturer: MICROCHIP [Microchip Technology]

HCS360
3.2
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
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 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
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.
DS40152D-page 6
SYNC_A, SYNC_B
(Synchronization Counter)
SEED_0, SEED_1, and SEED_2
(Seed Word)
SER_0, SER_1
(Encoder Serial Number)
CONFIG
(Configuration Word)
TABLE 3-2:
3.5.1
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 and FAST 0 selects the baud rate according to
Table 3-3.
TABLE 3-3:
Bit Number Symbol
10
12
13
14
15
11
0
1
2
3
4
5
6
7
8
9
400
200
200
100
T
LNGRD: LONG GUARD TIME
FAST 1, FAST 0 BAUD RATE SELECTION
E
LNGRD
FAST 0
FAST 1
NU
SEED
DELM
TIMO
IND
USRA0
USRA1
USRB0
USRB1
XSER
TMPSD
MANCH Manchester/PWM modula-
OVR
CONFIGURATION WORD
BAUD RATE SELECTION
FAST 1
 2001 Microchip Technology Inc.
Long Guard Time
Baud Rate Selection
Baud Rate Selection
Not Used
Seed Transmission enable
Delay mode enable
Time out enable
Independent mode enable
User bit
User bit
User bit
User bit
Extended serial number
enable
Temporary seed transmis-
sion enable
tion selection
Overflow bit
0
0
1
1
Bit Description
FAST 0
0
1
0
1