STM8AP5X27TAY datasheet(52/100 Pages) STMICROELECTRONICS

52 / 100 page

Option bytes

STM8AF61xx, STM8AF51xx

52/100

OPT3

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 wake-up unit/clock

0: LSI clock source selected for AWU

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

PRSC[1:0]: AWU clock prescaler

00: 24 MHz to 128 kHz prescaler

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 stabilisation time to 0, 16, 256, 4096 HSE cycles.

OPT6

TMU[3:0]: Enable temporary memory unprotection

0101: Read-out protection can be temporary disabled using a key

sequence.

Any other value: Permanent ROP

OPT7

WAIT STATE: Wait state configuration

This option configures the number of wait states inserted when reading

from the Flash/data EEPROM memory.

0: No wait state

1: One wait state

OPT8

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

Temporary unprotection key: Must be different from 00h or FFh

OPT9

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

Temporary unprotection key: Must be different from 00h or FFh

OPT10

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

Temporary unprotection key: Must be different from 00h or FFh

OPT11

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

Temporary unprotection key: Must be different from 00h or FFh

Table 13.

Option byte description (continued)

Option byte no.

Description

STM8AP5X27TAY Datasheet(PDF) 52 Page - STMicroelectronics

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