STLUX385ATR datasheet(19/99 Pages) STMICROELECTRONICS

19 / 99 page

DocID024387 Rev 2

19/98

STLUX385A

Product overview

3.4.1

Architecture

Figure 5. Flash and E2PROM internal memory organizations

•

The memory is organized in blocks of 128 bytes each

•

Read granularity: 1 word = 4 bytes

•

Write/erase granularity: 1 word (4 bytes) or 1 block (128 bytes) in parallel

•

Writing, erasing, word and block management is handled automatically by the memory

interface

3.4.2

Write protection (WP)

Write protection in application mode is intended to avoid unintentional overwriting of the

memory. The write protection can be removed temporarily by executing a specific sequence

in the user software.

3.4.3

Protection of user boot code (UBC)

In the STLUX385A a memory area of 32 Kbyte can be protected from overwriting at user

option level. In addition to the standard write protection, the UBC protection can exclusively

be modified via the debug interface, the user software cannot modify the UBC protection

status.

The UBC memory area contains the reset and interrupt vectors and its size can be adjusted

in increments of 512 bytes by programming the UBC and NUBC option bytes.

Note:

If users choose to update the boot code in the application programming (IAP), this has to be

protected so to prevent unwanted modification.

3.4.4

Read-out protection (ROP)

The STLUX385A provides a read-out protection of the code and data memory which can be

activated by an option byte setting.

UBC area

Remains write protected during IAP

Program memory area

Write access possible for IAP

Data memory area (1Kbytes)

Option bytes

Data EEPROM

memory

Flash program

memory

Programmable area

maximum 32 Kbytes

GIPC080520131510FSR

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