HCS515_11 datasheet(15/38 Pages) MICROCHIP

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DS40183E-page 15

HCS515

5.0

DECODER PROGRAMMING

The memory is divided between system memory that

stores the transmitter information (read protected) and

user memory (read/write). Commands to access the

user memory are described in Sections 4.2.5 and

4.2.6.

The following information stored in system memory

needs to be programmed before the decoder can be

used:

• 64-bit manufacturer’s code

• Decoder configuration byte

Note 1: These memory locations are read pro-

tected and can only be written to using

the program command with the device

powered up.

2: The contents of the system memory is

encrypted by a unique 64-bit key that

is stored in the HCS515. To initialize

the system memory, the HCS515’s

program command must be used.

5.1

Configuration Byte

The decoder is configured during initialization by set-

ting the appropriate bits in the configuration byte. The

following table list the options:

5.1.1

LRN_MODE

selects between two learning modes. With

LRN_MODE = 0

, the Normal (serial number derived)

mode is selected; with LRN_MODE = 1, the Secure

(seed derived) mode is selected. See Section 6.0 for

more detail on learning modes.

5.1.2

REPEAT

The HCS515 can be configured to indicate repeated

transmissions. In a stand-alone configuration, repeated

transmissions must be disabled.

Bit

Mnemonic

Description

LRN_MODE

Learning mode selection

LRN_MODE = 0

– Normal

Learn

LRN_MODE = 1

– Secure

Learn

Not Used

Reserved

REPEAT

Repeat Transmission enable

= Disable

= Enabled

Not Used

Reserved

Not Used

Reserved

Not Used

Reserved

Not Used

Reserved

Not Used

Reserved

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