ARM VERSION 1.2 - Manual (Page 208)

Thumb Instruction Reference
5-14 Copyright © 2000, 2001 ARM Limited. All rights reserved. ARM DUI 0068B
Examples
LDMIA r3!, {r0,r4}
LDMIA r5!, {r0-r7}
STMIA r0!, {r6,r7}
STMIA r3!, {r3,r5,r7}
Incorrect examples
LDMIA r3!,{r0,r9} ; high registers not allowed
STMIA r5!, {} ; must be at least one register
; in list
STMIA r5!,{r1-r6} ; value stored from r5 is unpredictable