STM8AF6268ITCU datasheet(47/99 Pages) STMICROELECTRONICS

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DocID14952 Rev 11

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STM8AF6246/48/66/68

Option bytes

OPT3

HSITRIM: Trimming option for 16 MHz internal RC oscillator

0: 3-bit on-the-fly trimming (compatible with devices based on the 128K

silicon)

1: 4-bit on-the-fly trimming

LSI_EN: Low speed internal clock enable

0: LSI clock is not available as CPU clock source

1: LSI clock is available as CPU clock source

IWDG_HW: Independent watchdog

0: IWDG independent watchdog activated by software

1: IWDG independent watchdog activated by hardware

WWDG_HW: Window watchdog activation

0: WWDG window watchdog activated by software

1: WWDG window watchdog activated by hardware

WWDG_HALT: Window watchdog reset on Halt

0: No reset generated on Halt if WWDG active

1: Reset generated on Halt if WWDG active

OPT4

EXTCLK: External clock selection

0: External crystal connected to OSCIN/OSCOUT

1: External clock signal on OSCIN

CKAWUSEL: Auto-wakeup 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

00: Reserved

01: 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

This configures the stabilization time to 0.5, 8, 128, and 2048 HSE cycles

with corresponding option byte values of 0xE1, 0xD2, 0xB4, and 0x00.

OPT6

TMU[3:0]: Enable temporary memory unprotection

0101: TMU disabled (permanent ROP).

Any other value: TMU enabled.

OPT7

Reserved

OPT8

TMU_KEY 1 [7:0]: Temporary unprotection key 0

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

OPT9

TMU_KEY 2 [7:0]: Temporary unprotection key 1

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

OPT10

TMU_KEY 3 [7:0]: Temporary unprotection key 2

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

OPT11

TMU_KEY 4 [7:0]: Temporary unprotection key 3

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

Table 16. Option byte description (continued)

Option byte no.

Description

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