HCS320 datasheet(6/38 Pages) MICROCHIP

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HCS320

DS41097D-page 6

FIGURE 2-2:

ENCODER OPERATION

3.0

EEPROM MEMORY

ORGANIZATION

The HCS320 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 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.

Power-Up

RESET and Debounce Delay

(10 ms)

Encrypt With

Load Transmit Register

Buttons

Added?

All

Buttons

Released?

(Button pressed) Set TX:= OFF

Transmit

Stop

Crypt Key

Complete Code

Word Transmission

Transmit

Button Pressed?

Increment Shift Level

Stop Transmit

Shift

Button Pressed?

TX=ON?

Update Sync Info

TX=ON?

Set TX:=ON

Yes

WORD

ADDRESS

MNEMONIC

DESCRIPTION

KEY_0

64-bit encryption key

(word 0) LSb’s

KEY_1

64-bit encryption key

(word 1)

KEY_2

64-bit encryption key

(word 2)

KEY_3

64-bit encryption key

(word 3) MSb’s

SYNC

16-bit synchronization

value

RESERVED Set to 0000H

SER_0

Device Serial Number

(word 0) LSb’s

SER_1(Note) Device Serial Number

(word 1) MSb’s

—

Not used

—

Not used

RESERVED Set to 0000H

CONFIG

Configuration Word

Note:

The MSB of the serial number contains a

bit used to select the Auto-shutoff timer.

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