HCS360T-SLASHP datasheet(6/28 Pages) MICROCHIP

6 / 28 page

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

the

status

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

LNGRD

Long Guard Time

FAST 0

Baud Rate Selection

FAST 1

Baud Rate Selection

Not Used

SEED

Seed Transmission enable

DELM

Delay mode enable

TIMO

Time out enable

IND

Independent mode enable

USRA0

User bit

USRA1

User bit

USRB0

User bit

USRB1

User bit

XSER

Extended serial number

enable

TMPSD

Temporary seed transmis-

sion enable

MANCH

Manchester/PWM modula-

tion selection

OVR

Overflow bit

FAST 1

FAST 0

400

200

100

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