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STM8AF/P6368 数据表(PDF) 47 Page - STMicroelectronics |
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STM8AF/P6368 数据表(HTML) 47 Page - STMicroelectronics |
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47 / 95 page  DS12343 Rev 2 47/95 STM8AF6366 Option bytes 93 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 (extended precision) 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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