Rationale behind the Modebits

hi The mode bits of ARM7 in CPSR are of 5 bit width when the processor is capable of operating in one of the 7 modes. I would like to know what is the rationale behind using 2 additional bits instead of going only for 3 bits(that can represent max of 8 states). Has it got to do with anything related to simpler implementation logic or is it for any particular historic reasons associated with ARM processor


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