Programming STM8 Flash microcontrollers

PM0054

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Doc ID 15433 Rev 9

SWIM active

(ICP mode)

Readout

protection

enabled

Interrupt vectors except for TRAP and TLI (if

available)

P

TRAP and TLI (if available)

P

Proprietary code area (PCODE) (if available)

P(6)

User boot code area (UBC)

P

Main program

P

Data EEPROM area (DATA)

P

Option bytes

(9)

Readout

protection

disabled

Interrupt vectors except for TRAP and TLI (if

available)

R/W(3)/E

TRAP and TLI (if available)

R/W/E

Proprietary code area (PCODE) (if available)

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

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);

2.

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

3.

If a PCODE area has been defined, then TRAP and TLI vectors cannot be modified in user and IAP mode, otherwise TRAP

and TLI follow 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. If wrong keys are provided, the

device must be reset and new keys programmed.

5.

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 wrong keys are provided, another key program

sequence can be performed without resetting the device.

6.

When available, the PCODE area can be read and executed only in privileged mode through TRAP and TLI vectors. The

PCODE cannot be directly accessed through the SWIM.

7.

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

8.

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 wrong keys are

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

9.

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

Table 10.

Mode

ROP

Memory Area

Low density

STM8L101x

Low and medium

density

STM8L05x/15x

Medium density

STM8AL31xx /

STM8AL3Lxx

High density

STM8L05x/15x/16x

Access from core