HCS515 データシートの表示（PDF） - Microchip Technology

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HCS515

KEELOQ Code Hopping Decoder

Microchip Technology 

HCS515

5.0 DECODER PROGRAMMING

The memory is divided between system memory that stores the transmitter information (read protected) and user mem-

ory (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 protected 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 setting the appropriate bits in the configuration byte. The following table

list the options:

Bit

Mnemonic

Description

0

LRN_MODE Learning mode selection

LRN_MODE = 0—Normal Learn

LRN_MODE = 1—Secure Learn

1

Not Used Reserved

2

REPEAT Repeat Transmission enable

0 = Disable

1 = Enabled

3

Not Used Reserved

4

Not Used Reserved

5

Not Used Reserved

6

Not Used Reserved

7

Not Used Reserved

5.1.1 LRN_MODE

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 transmis-

sions must be disabled.

DS40183A-page 14

Preliminary

© 1998 Microchip Technology Inc.

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