STM8S005C6 datasheet(39/97 Pages) STMICROELECTRONICS

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STM8S005C6 STM8S005K6

Option bytes

Table 12. Option byte description

Option byte no.

Description

OPT0

ROP[7:0] Memory readout protection (ROP)

0xAA: Enable readout protection (write access via SWIM protocol)



Note: Refer to the family reference manual (RM0016) section on

Flash/EEPROM memory readout protection for details.

OPT1

UBC[7:0] User boot code area

0x00: no UBC, no write-protection



0x01: Pages 0 to 1 defined as UBC, memory write-protected



0x02: Pages 0 to 3 defined as UBC, memory write-protected



0x03: Pages 0 to 4 defined as UBC, memory write-protected



...



0xFE: Pages 0 to 255 defined as UBC, memory write-protected



0xFF: Reserved



Note: Refer to the family reference manual (RM0016) section on

Flash/EEPROM write protection for more details.

OPT2

AFR[7:0]

Refer to Table 13: Description of alternate function remapping bits [7:0] of

OPT2

OPT3

HSITRIM: high-speed internal clock trimming register size

0: 3-bit trimming supported in CLK_HSITRIMR register



1: 4-bit trimming supported in CLK_HSITRIMR register

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 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

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