RM0312 datasheet(34/275 Pages) STMICROELECTRONICS

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Flash program memory and data EEPROM

RM0312

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DocID022352 Rev 3

Table 6. Memory access versus programming method(1)

Mode

ROP

Memory area

Access from

core

User mode, IAP, and

bootloader

Readout protection

enabled

Interrupt vectors except for TRAP

R/W(2)/E

TRAP

R/W(3)/E

Proprietary code area (PCODE)

R/E(6)

User boot code area (UBC)

R/E

Main program

R/W/E(4)

Data EEPROM area (DATA)

R/W(5)

Option bytes

Readout protection

disabled

Interrupt vectors except for TRAP

R/W(2)/E

TRAP

R/W(3)/E

Proprietary code area (PCODE)

R/E(6)

User boot code area (UBC)

R/E(7)

Main program

R/W/E(4)

Data EEPROM area (DATA)

R/W(5)

Option bytes

R/W(8)

SWIM active

(ICP mode)

Readout protection

enabled

Interrupt vectors except for TRAP

TRAP

Proprietary code area (PCODE)

P(6)

User boot code area (UBC)

Main program

Data EEPROM area (DATA)

Option bytes

P/WROP(9)

Readout protection

disabled

Interrupt vectors except for TRAP

R/W(2)/E

TRAP

R/W/E

Proprietary code area (PCODE)

R/E(6)

User boot code area (UBC)

R/E(7)

Main program

R/W/E(4)

Data EEPROM area (DATA)

R/W(5)

Option bytes

R/W(7)

1. R/W/E = Read, write, and execute

R/E = Read and execute (write operation forbidden)

R = Read (write and execute operations forbidden)

P = The area cannot be accessed (read, execute and write operations forbidden)

P/WROP = Protected, write forbidden except for ROP option byte.

2. When no UBC area has been defined, the interrupt vectors, except for TRAP, can be modified in user/IAP mode.

3. If a PCODE area has been defined, the TRAP vector cannot be modified in user and IAP mode, otherwise TRAP follows

the same rules as other interrupt vectors.

4. The Flash program memory is write protected (locked) until the correct MASS key is written in the FLASH_PUKR. It is

possible to lock the memory again by resetting the PUL bit in the FLASH_IAPSR register. Unlocking can only be done once

between two resets. If incorrect keys are provided, the device must be reset and new keys programmed.

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