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STM8S003F3 Datasheet(PDF) 43 Page - STMicroelectronics |
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STM8S003F3 Datasheet(HTML) 43 Page - STMicroelectronics |
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43 / 104 page  DocID018576 Rev 9 43/104 STM8S003F3 STM8S003K3 Option bytes 45 OPT1 UBC[7:0] User boot code area 0x00: no UBC, no write-protection 0x01: Pages 0 defined as UBC, memory write-protected 0x02: Pages 0 to 1 defined as UBC, memory write-protected Page 0 and page 1 contain the interrupt vectors. ... 0x7F: Pages 0 to 126 defined as UBC, memory write-protected Other values: Pages 0 to 127 defined as UBC, memory-write protected. Note: Refer to the family reference manual (RM0016) section on Flash/EEPROM write protection for more details. OPT2 AFR[7:0] Refer to the following section for alternate function remapping descriptions of bits [7:2] and [1:0] respectively. 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 OPT5 HSECNT[7:0]: HSE crystal oscillator stabilization time This configures the stabilization time. 0x00: 2048 HSE cycles 0xB4: 128 HSE cycles 0xD2: 8 HSE cycles 0xE1: 0.5 HSE cycles Table 13. Option byte description (continued) Option byte no. Description |
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