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SH7243 Datasheet(PDF) 284 Page - Renesas Technology Corp |
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SH7243 Datasheet(HTML) 284 Page - Renesas Technology Corp |
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284 / 1726 page  Section 9 Bus State Controller (BSC) Rev. 1.00 Jun. 26, 2008 Page 254 of 1692 REJ09B0393-0100 • Initial Settings of Big Endian / Little Endian The initial settings of byte-data alignment of areas 1 to 7 can be selected as big endian or little endian. In on-chip ROM-disabled mode, the endianness of area 0 cannot be changed from its initial setting after a power-on reset, but the endianness of areas 1 to 7 can be changed by register settings in the program. In on-chip ROM-enabled mode, all the endianness of areas 1 to 7 can be changed by register settings in the program. Area 0 cannot be selected as little endian. Since the instruction fetch is mixed with the 32- and 16-bit access and the allocation to the little endian area is difficult, the instruction must be executed within the big endian area. For details of mode settings, see section 3, MCU Operating Modes. |
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