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STM8AF/P6346 数据表(PDF) 44 Page - STMicroelectronics |
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STM8AF/P6346 数据表(HTML) 44 Page - STMicroelectronics |
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44 / 95 page  Option bytes STM8AF6366 44/95 DS12343 Rev 2 9 Option bytes Option bytes contain configurations for device hardware features as well as the memory protection of the device. They are stored in a dedicated block of the memory. Each option byte has to be stored twice, for redundancy, in a regular form (OPTx) and a complemented one (NOPTx), except for the ROP (read-out protection) option byte and option bytes 8 to 16. Option bytes can be modified in ICP mode (via SWIM) by accessing the EEPROM address shown in Table 15: Option bytes below. Option bytes can also be modified ‘on the fly’ by the application in IAP mode, except the ROP and UBC options that can only be toggled in ICP mode (via SWIM). Refer to the STM8 Flash programming manual (PM0051) and STM8 SWIM communication protocol and debug module user manual (UM0470) for information on SWIM programming procedures. Table 15. Option bytes Addr. Option name Option byte no. Option bits Factory default setting 76 5 4 3 2 1 0 0x00 4800 Read-out protection (ROP) OPT0 ROP[7:0] 0x00 0x00 4801 User boot code (UBC) OPT1 Reserved UBC[5:0] 0x00 0x00 4802 NOPT1 Reserved NUBC[5:0] 0xFF 0x00 4803 Alternate function remapping (AFR) OPT2 AFR7 AFR6 AFR5 AFR4 AFR3 AFR2 AFR1 AFR0 0x00 0x00 4804 NOPT2 NAFR 7 NAFR 6 NAFR 5 NAFR 4 NAFR 3 NAFR 2 NAFR 1 NAFR 0 0xFF 0x00 4805 Watchdog option OPT3 Reserved HSITRI M LSI _EN IWDG _HW WWDG _HW WWDG _HALT 0x00 0x00 4806 NOPT3 Reserved NHSITRI M NLSI _EN NIWDG _HW NWWD G_HW NWWG _HALT 0xFF 0x00 4807 Clock option OPT4 Reserved EXT CLK CKAWU SEL PRS C1 PRS C0 0x00 0x00 4808 NOPT4 Reserved NEXT CLK NCKAW USEL NPR SC1 NPR SC0 0xFF 0x00 4809 HSE clock startup OPT5 HSECNT[7:0] 0x00 0x00 480A NOPT5 NHSECNT[7:0] 0xFF |
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