HCS512_02 datasheet(9/26 Pages) MICROCHIP

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DS40151D-page 9

HCS512

5.0

INTEGRATING THE HCS512

INTO A SYSTEM

The HCS512 can act as a stand-alone decoder or be

interfaced to a microcontroller. Typical stand-alone

applications include garage door openers and elec-

tronic door locks. In stand-alone applications, the

HCS512 will handle learning, reception, decryption,

and validation of the received code; and generate the

appropriate output. For a garage door opener, the

HCS512 input will be connected to an RF receiver, and

the output, to a relay driver to connect a motor control-

ler.

Typical systems where the HCS512 will be connected

to a microcontroller include vehicle and home security

systems. The HCS512 input will be connected to an RF

receiver and the function outputs to the microcontroller.

The HCS512 will handle all the decoding functions and

the microcontroller, all the system functions. The Serial

Output mode with a 1- or 2-wire interface can be used

if the microcontroller is I/O limited.

6.0

DECODER PROGRAMMING

The PG306001 production programmer will allow easy

setup and programming of the configuration byte and

the manufacturer’s code.

6.1

Configuration Byte

The configuration byte is used to set system configura-

tion for the decoder. The LRN bits determine which

algorithm (Decrypt or XOR) is used for the key genera-

tion. SC_LRN determines whether normal learn (key

derived from serial number) or secure learn (key

derived from seed value) is used.

TABLE 6-1:

CONFIGURATION BYTE

TABLE 6-2:

LEARN METHOD LRN0, LRN1

DEFINITIONS

Bit

Name

Description

LRN0

Learn algorithm select

LRN1

Not used

SC_LRN

Secure Learn enable (1 = enabled)

SLEEP

SLEEP enable (1 = enabled)

RES1

Not used

RES2

Not used

RES3

Not used

RES4

Not used

LRN0

Description

Decrypt algorithm

XOR algorithm

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