STM8S105C4 datasheet(48/121 Pages) STMICROELECTRONICS

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Option byte

STM8S105x4/6

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DocID14771 Rev 15

OPT4

EXTCLK:

External clock selection

0: External crystal connected to OSCIN/OSCOUT

1: External clock signal on OSCIN

CKAWUSEL:

Auto wake-up unit/clock

0: LSI clock source selected for AWU

1: HSE clock with prescaler selected as clock source for AWU

PRSC[1:0]

AWU clock prescaler

0x: 16 MHz to 128 kHz prescaler

10: 8 MHz to 128 kHz prescaler

11: 4 MHz to 128 kHz prescaler

OPT5

HSECNT[7:0]:

HSE crystal oscillator stabilization time

0x00: 2048 HSE cycles

0xB4: 128 HSE cycles

0xD2: 8 HSE cycles

0xE1: 0.5 HSE cycles

OPT6

Reserved

OPT7

Reserved

OPTBL

BL[7:0]:

Bootloader option byte

For STM8S products, this option is checked by the boot ROM code after

reset. Depending on the content of addresses 0x487E, 0x487F, and 0x8000

(reset vector), the CPU jumps to the bootloader or to the reset vector. Refer

to the UM0560 (STM8L/S bootloader manual) for more details.

For STM8L products, the bootloader option bytes are on addresses 0xXXXX

and 0xXXXX+1 (2 byte). These option bytes control whether the bootloader is

active or not. For more details, refer to the UM0560 (STM8L/S bootloader

manual) for more details.

Table 12. Option byte description (continued)

Option byte no.

Description

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