ST7DALIF2 datasheet(21/171 Pages) STMICROELECTRONICS

21 / 171 page

ST7DALIF2

Flash program memory

21/171

mode unexpectedly during a reset. In the application, even if the pin is configured as output,

any reset will put it back in input pull-up.

Figure 4.

Typical ICC interface

6.5

Memory protection

There are two different types of memory protection: Read Out Protection and Write/Erase

Protection which can be applied individually.

6.5.1

Readout protection

Readout protection, when selected provides a protection against program memory content

extraction and against write access to Flash memory. Even if no protection can be

considered as totally unbreakable, the feature provides a very high level of protection for a

general purpose microcontroller. Both program and data E2 memory are protected.

In flash devices, this protection is removed by reprogramming the option. In this case, both

program and data E2 memory are automatically erased and the device can be

reprogrammed.

Readout protection selection depends on the device type:

●

In Flash devices it is enabled and removed through the FMP_R bit in the option byte.

●

In ROM devices it is enabled by mask option specified in the Option List.

6.5.2

Flash write/erase protection

Write/erase protection, when set, makes it impossible to both overwrite and erase program

memory. It does not apply to E2 data. Its purpose is to provide advanced security to

applications and prevent any change being made to the memory content.

Caution:

Once set, Write/erase protection can never be removed. A write-protected flash device is no

longer reprogrammable.

Write/erase protection is enabled through the FMP_W bit in the option byte.

ICC CONNECTOR

HE10 CONNECTOR TYPE

APPLICATION

POWER SUPPLY

PROGRAMMING TOOL

ICC CONNECTOR

APPLICATION BOARD

ICC Cable

(See Note 3)

ST7

OPTIONAL

See Note 1 and Caution

See Note 2

APPLICATION

RESET SOURCE

APPLICATION

I/O

(See Note 4)

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