Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
104
10.12.6.3 Restrictions
In these instructions:
 Rn must not be PC
 reglist must not contain SP
 in any STM instruction, reglist must not contain PC
 in any LDM instruction, reglist must not contain PC if it contains LR
 reglist must not contain Rn if you specify the writeback suffix.
When PC is in reglist in an LDM instruction:
 bit[0] of the value loaded to the PC must be 1 for correct execution, and a branch occurs to this halfword-
aligned address
 if the instruction is conditional, it must be the last instruction in the IT block.
10.12.6.4 Condition flags
These instructions do not change the flags.
10.12.6.5 Examples
LDM R8,{R0,R2,R9} ; LDMIA is a synonym for LDM
STMDB R1!,{R3-R6,R11,R12}
10.12.6.6 Incorrect examples
STM R5!,{R5,R4,R9} ; Value stored for R5 is unpredictable
LDM R2, {} ; There must be at least one register in the list