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In 1.4.1. Format summary section of ARM7TDMI Technical Reference Manual, the Figure 1-5 show that the 25th bit of ARM7TDMI Data-processing instructions is always 1, but according to ARM Architecture Reference Manual, this bit stand for whether the shifter operand is immediate and can be 0. This bit is I bit, because I looks like 1, I guess it may be a typo in ARM7TDMI Technical Reference Manual. Is it really a typo?