Datasheet > 80C52-40R

80C52-40R

更新时间： 2022-12-11 19:08:47

品牌	Logo	应用领域
TEMIC		微控制器
页数	文件大小	规格书
20页	227K
描述
CMOS 0 to 44 MHz Single-chip 8 Bit Microcontroller

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中文翻译

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数据手册

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80C52-40R 数据手册

MATRA MHS

80C32/80C52

80C52 with Secret ROM

80C52 with Secret TAG

Matra MHS offers 80C52 with the encrypted secret ROM

option to secure the ROM code contained in the 80C52

microcontrollers.

Matra MHS offers special 64-bit identifier called

“SECRET TAG” on the microcontroller chip.

The Secret Tag option is available on both ROMless and

masked microcontrollers.

The clear reading of the program contained in the ROM

is made impossible due to an encryption through several

random keys implemented during the manufacturing

process.

The Secret Tag feature allows serialization of each

microcontroller for identification of

specific

equipment. A unique number per device is implemented

in the chip during manufacturing process. The serial

number is a 64-bit binary value which is contained and

addressable in the Special Function Registers (SFR) area.

The keys used to do such encryption are selected

randomwise and are definitely different from one

microcontroller to another.

This encryption is activated during the following phases :

This Secret Tag option can be read-out by a software

routine and thus enables the user to do an individual

identity check per device. This routine is implemented

inside the microcontroller ROM memory in case of

masked version which can be kept secret (and then the

value of the Secret Tag also) by using a ROM Encryption.

–

Everytime a byte is addressed during a verify of the

ROM content, a byte of the encryption array is

selected.

MOVC instructions executed from external program

memory are disabled when fetching code bytes from

internal memory.

For further information, please refer to the application

note (ANM031) available upon request.

EA is sampled and latched on reset, thus all state

modification are disabled.

For further information please refer to the application

note (ANM053) available upon request.

Rev. E (31/08/95)

1...6 7 8910 11 12...20

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