STM8AL3136 datasheet(55/124 Pages) STMICROELECTRONICS

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STM8AL313x/4x/6x STM8AL3L4x/6x

Option bytes

Option bytes contain configurations for device hardware features as well as the memory

protection of the device. They are stored in a dedicated memory block.

All option bytes can be modified in ICP mode (with SWIM) by accessing the EEPROM

address. See Table 12 for details on option byte addresses.

The option bytes can also be modified ‘on the fly’ by the application in IAP mode, except for

the ROP, and UBC values which can only be taken into account when they are modified in

ICP mode (with the SWIM).

Refer to the STM8L15x/STM8L16x Flash programming manual (PM0054) and STM8 SWIM

and Debug Manual (UM0320) for information on SWIM programming procedures.

Table 12. Option byte addresses

Address

Option name

Option

byte

No.

Option bits

Factory

default

setting

7654

0x00 4800

Read-out

protection

(ROP)

OPT0

ROP[7:0]

0xAA

0x00 4802

UBC (User

Boot code size)

OPT1

UBC[7:0]

0x00

0x00 4807

Reserved

0x00

0x00 4808

Independent

watchdog

option

OPT3

[3:0]

Reserved

WWDG

_HALT

WWDG

_HW

IWDG

_HALT

IWDG

_HW

0x00

0x00 4809

Number of

stabilization

clock cycles for

HSE and LSE

oscillators

OPT4

Reserved

LSECNT[1:0]

HSECNT[1:0]

0x00

0x00 480A

Brownout reset

(BOR)

OPT5

[3:0]

Reserved

BOR_TH

BOR

_ON

0x01

0x00 480B

Bootloader

option bytes

(OPTBL)

OPTBL

[15:0]

OPTBL[15:0]

0x00

0x00 480C

0x00

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