STM8AF5168 datasheet(55/110 Pages) STMICROELECTRONICS

55 / 110 page

STM8AF52/62xx, STM8AF51/61xx

Option bytes

Doc ID 14395 Rev 9

55/110

OPT12

TMU_KEY 5 [7:0]: Temporary unprotection key 4

Temporary unprotection key: Must be different from 0x00 or 0xFF

OPT13

TMU_KEY 6 [7:0]: Temporary unprotection key 5

Temporary unprotection key: Must be different from 0x00 or 0xFF

OPT14

TMU_KEY 7 [7:0]: Temporary unprotection key 6

Temporary unprotection key: Must be different from 0x00 or 0xFF

OPT15

TMU_KEY 8 [7:0]: Temporary unprotection key 7

Temporary unprotection key: Must be different from 0x00 or 0xFF

OPT16

TMU_MAXATT [7:0]: TMU access failure counter

TMU_MAXATT can be initialized with the desired value only if TMU is

disabled (TMU[3:0]=0101 in OPT6 option byte).

When TMU is enabled, any attempt to temporary remove the readout

protection by using wrong key values increments the counter.

When the option byte value reaches 0x08, the Flash memory and data

EEPROM are erased.

OPT17

BL[7:0]: Bootloader enable

If this option byte is set to 0x55 (complementary value 0xAA) the

bootloader program is activated also in case of a programmed code

memory (for more details, see the bootloader user manual, UM0560).

Table 21.

Option byte description (continued)

Option byte no.

Description

STM8AF5168 Datasheet(PDF) 55 Page - STMicroelectronics