HCS412-/P

更新时间： 2024-01-19 23:00:20

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HCS412-/P 数据手册

HCSXXX

HCSXXX Memory Programming Specification

This document includes the

programming specifications for the

following devices:

1.2

Program/Verify Mode

The Program/Verify mode for the KEELOQ devices

allows programming for all memory locations within the

device being programmed. With the exception of the

decoders, these pins are also used to verify the memory

arrays.

• HCS200

• HCS201

• HCS300

• HCS301

• HCS320

• HCS360

• HCS361

• HCS362

• HCS410

• HCS412

• HCS500

• HCS512

• HCS515

1.0

PROGRAMMING THE HCSXXX

All of the KEELOQ devices are programmed using a

serial method. This Serial mode allows KEELOQ

devices to be programmed while in users' systems,

which increases the flexibility of designing

cryptographic encoders, decoders and transponders

into electronic systems. While some of the devices are

capable of being programmed through wireless

communications, the subject of this document is

focused on wired programmers that make contact with

the KEELOQ products while the components are in-

circuit or in a programmer socket. Additionally, this

programming specification only applies to all KEELOQ

devices listed above in all packages.

Note:

For the purpose of this document,

“KEELOQ devices” and “KEELOQ products”

refers to all of the components listed

above.

1.1

Programming Algorithm

Requirements

Depending on the device being programmed, the

method for entering Programming mode can be

achieved through the use of a combination of logic level

signals applied to the programming pins. One or two

pins are capable of accepting clock signals, while

another pin is dedicated to bidirectional data. These

pins are detailed in Table 1-1.

Additionally, the programming voltage range for VDD is

+5V ± 10% for all the KEELOQ devices. There is not a

requirement to apply high voltages to any of the pins

beyond the level of VDD in order to enter the

Programming mode. For more details about pin

configurations during programming, refer to Table 1-1.

 2004 Microchip Technology Inc.

Preliminary

DS41256A-page 1

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