SH7280 Datasheet, PDF (284/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 9 Bus State Controller (BSC)
• 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.
Rev. 1.00 Jun. 26, 2008 Page 254 of 1692
REJ09B0393-0100