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ARM7

Note: This was originally posted on 28th November 2011 at http://forums.arm.com

i have a doubt related to ARM7TDMI.
in ARM7 architecture, the lower 5bits of CPSR register is MODE bits. we have 7modes in ARM7. when these 7 modes can be specified using 3bits, why 5bits have been set for mode selection?

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sibin thomas over 12 years ago

Note: This was originally posted on 28th November 2011 at http://forums.arm.com

i thought the same, but just wanted to clarify if there is any other technical reason behind.

Future expansion?

v3 only had 6 modes (no System mode from memory)
v6Z added Monitor mode
v7-A added Hyp mode
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sibin thomas over 12 years ago

Note: This was originally posted on 28th November 2011 at http://forums.arm.com

i thought the same, but just wanted to clarify if there is any other technical reason behind.

Future expansion?

v3 only had 6 modes (no System mode from memory)
v6Z added Monitor mode
v7-A added Hyp mode
Cancel
Vote up 0 Vote down

Cancel

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