HCS362 datasheet(15/46 Pages) MICROCHIP

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DS40189E-page 15

HCS362

4.0

EEPROM MEMORY

ORGANIZATION

The HCS362 contains 288 bits (18 x 16-bit words) of

EEPROM memory (Table 4-1). This EEPROM array is

used to store the encryption key information and

synchronization value. Further descriptions of the

memory array is given in the following sections.

TABLE 4-1:

EEPROM MEMORY MAP

4.1

KEY_0 - KEY_3

(64-bit Crypt Key)

The 64-bit crypt key is used to create the encrypted

message transmitted to the receiver. This key is calcu-

lated and programmed during production using a key

generation algorithm. The key generation algorithm

may be different from the KEELOQ algorithm. Inputs to

the key generation algorithm are typically the transmit-

ter’s serial number and the 64-bit 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

creating

the

key

for

decryption purposes.

4.2

SYNC (Synchronization Counter)

This is the 16-bit synchronization value that is used to

create the hopping code for transmission. This value

will be incremented after every transmission.

4.3

SEED_0, SEED_1, SEED_2,

and SEED 3 (Seed Word)

This is the four word (60 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 dif-

ferent key generation/tracking process or purely as a

fixed code transmission.

4.4

SERIAL_0, SERIAL_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.

Word

Address

Field

Description

KEY1_0

64-bit Encryption Key1

(Word 0) LSB

KEY1_1

64-bit Encryption Key1

(Word 1)

KEY1_2

64-bit Encryption Key1

(Word 2)

KEY1_3

64-bit Encryption Key1

(Word 3) MSB

KEY2_0

64-bit Encryption Key2

(Word 0) LSB

KEY2_1

64-bit Encryption Key2

(Word 1)

KEY2_2

64-bit Encryption Key2

(Word 2)

KEY2_3

64-bit Encryption Key2

(Word 3) MSB

SEED_0

Seed value (Word 0)

LSB

SEED_1

Seed value (Word 1)

SEED_2

Seed value (Word 2)

SEED_3

Seed value (Word 3)

MSB

CONFIG_0

Configuration Word

(Word 0)

CONFIG_1

Configuration Word

(Word 1)

SERIAL_0

Serial Number

(Word 0) LSB

SERIAL_1

Serial Number

(Word 1) MSB

SYNC

Synchronization counter

RES

Reserved – Set to zero

Note:

Upper four Significant bits of SEED_3 con-

tains extra configuration information (see

Table 4-4).

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