ARM VERSION 1.2 - Manual (Page 221)

Thumb Instruction Reference
ARM DUI 0068B Copyright © 2000, 2001 ARM Limited. All rights reserved. 5-27
Examples
CMP r2,#255
CMP r7,r12 ; high register IS allowed with CMP Rn,Rm
CMN r1,r5
Incorrect examples
CMP r2,#508 ; immediate value out of range
CMP r9,#24 ; high register not allowed with #expr
CMN r0,r10 ; high register not allowed with CMN