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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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SH7041A bảng dữ liệu(PDF) 757 Page - Renesas Technology Corp |
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SH7041A bảng dữ liệu(HTML) 757 Page - Renesas Technology Corp |
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757 / 923 page  719 22.8.2 Software Protection Software protection can be implemented by setting the SWE bit in FLMCR1, erase block register 1 (EBR1), erase block register 2 (EBR2), and the RAMS bit in the RAM emulation register (RAMER). When software protection is in effect, setting the P1 or E1 bit in flash memory control register 1 (FLMCR1), or the P2 or E2 bit in flash memory control register 2 (FLMCR2), does not cause a transition to program mode or erase mode. (See table 22.9.) Software protect can be enabled by setting the SWE bit of FLMCR1, block specification register 1 (EBR1), block specification register 2 (EBR2) and the RAMS bit of the RAM emulation register. During software protect, transition cannot be made to the program mode or the erase mode even when setting P1 or E1 bits of the flash memory control register 1 (FLMCR1), or P2 or E2 bits of flash memory control register 2 (FLMCR2). (See table 22.9.) Table 22.9 Software Protection Function Item Description Program Erase SWE bit protection • Clearing the SWE bit to 0 in FLMCR1 sets the program/erase-protected state for all blocks. (Execute in on-chip RAM or external memory.) Yes Yes Block specification protection • Erase protection can be set for individual blocks by settings in erase block register 1 (EBR1) and erase block register 2 (EBR2). • Setting EBR1 and EBR2 to H'00 places all blocks in the erase-protected state. — Yes Emulation protection • Setting the RAMS bit to 1 in the RAM emulation register (RAMER) places all blocks in the program/erase-protected state. Yes Yes |
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