STM8S datasheet(50/467 Pages) STMICROELECTRONICS

50 / 467 page

Flash program memory and data EEPROM

RM0016

50/467

DocID14587 Rev 14

Refer to the STM8S and STM8AF Flash programming manual (PM0051) and STM8 SWIM

protocol and debug manual (UM0470) for more information on programming procedures.

Table 6. Memory access versus programming method(1)

Mode

ROP

Memory Area

Access from

core

User, IAP, and bootloader

(if available)

Readout

protection

enabled

User boot code area (UBC)

R/E

Main program

R/W/E(2)

Data EEPROM area (DATA)

R/W(3)

Option bytes

Readout

protection

disabled

User boot code area (UBC)

R/E(4)

Main program

R/W/E(2)

Data EEPROM area (DATA)

R/W(3)

Option bytes

R/W(5)

SWIM active

(ICP mode)

Readout

protection

enabled

User boot code area (UBC)

Main program

Data EEPROM area (DATA)

Option bytes

P/WROP(6)

Readout

protection

disabled

User boot code area (UBC)

R/E(4)

Main program

R/W/E(2)

Data EEPROM area (DATA)

R/W(3)

Option bytes

R/W(5)

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. 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. If incorrect keys are provided, the

device must be reset and new keys programmed.

3. The data memory is write protected (locked) until the correct MASS key is written in the FLASH_DUKR. It is possible to lock

the memory again by resetting the DUL bit in the IAPSR register. If incorrect keys are provided, another key program

sequence can be performed without resetting the device.

4. To program the UBC area, the application must first clear the UBC option byte.

5. The option bytes are write protected (locked) until the correct MASS key is written in the FLASH_DUKR (with OPT set to 1).

It is possible to lock the memory again by resetting the DUL bit in the FLASH_IAPSR register. If incorrect keys are

provided, another key program sequence can be performed without resetting the device.

6. When ROP is removed, the whole memory is erased, including the option bytes.

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