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ST7LITEUS5 数据表(PDF) 124 Page - STMicroelectronics |
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ST7LITEUS5 数据表(HTML) 124 Page - STMicroelectronics |
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124 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Device configuration and ordering information ST7LITEUS2, ST7LITEUS5 124/136 14.1.2 OPTION BYTE 0 Table 75. Startup clock selection Configuration CKSEL1 CKSEL0 Internal RC as Startup Clock 0 0 Reserved 0 0 AWU RC as a Startup Clock 0 1 Reserved 1 0 External Clock on pin PA5 1 1 Table 76. LVD threshold configuration Configuration LVD1 LVD0 LVD Off 11 Highest voltage threshold 1 0 Medium voltage threshold 0 1 Lowest voltage threshold 0 0 Bits 7:4 Reserved, must always be 1. Bit 3 Reserved, must always be 0. Bit 2 SEC0 Sector 0 size definition This option bit indicates the size of sector 0 according to the following table (see Table 77: Definition of sector 0 size). Bit 1 FMP_R Readout protection Readout protection, when selected provides a protection against program memory content extraction and against write access to Flash memory. Erasing the option bytes when the FMP_R option is selected will cause the whole memory to be erased first, and the device can be reprogrammed. Refer to Section 4.5 and the ST7 Flash Programming Reference Manual for more details. 0: Readout protection off 1: Readout protection on Bit 0 FMP_W FLASH write protection This option indicates if the FLASH program memory is write protected. Warning: When this option is selected, the program memory (and the option bit itself) can never be erased or programmed again. 0: Write protection off 1: Write protection on Table 77. Definition of sector 0 size Sector 0 Size SEC0 0.5k 0 1k 1 Obsolete Product(s) - Obsolete Product(s) |
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