P80C32 datasheet(9/20 Pages) TEMIC

9 / 20 page

80C32/80C52

Rev. G (14 Jan. 97)

MATRA MHS

80C52 with Secret ROM

TEMIC offers 80C52 with the encrypted secret ROM

option to secure the ROM code contained in the 80C52

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 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 :

–

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.

–

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.

80C52 with Secret TAG

TEMIC 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 Secret Tag feature allows serialization of each

microcontroller

for

identification

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.

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.

For further information, please refer to the application

note (ANM031) available upon request.

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