Rationale behind the Modebits

From: kishore.ln@xxxxxxxxx
Date: 27 Oct 2006 06:32:18 -0700

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

kishore

.

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Rationale behind the Mode bits
... 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. ...
(comp.sys.arm)
Re: Rationale behind the Mode bits
... capable of operating in one of the 7 modes. ... ARM is more than ARM7. ... You have to consider the people struggling with architecture-specific code, device upgrades, etc. ...
(comp.sys.arm)