Instruction MOVW.W

Hi

I executed instruction in .asm file

mov r0, #0x4096

Then, in disassembly window, I found that

this instruction become MOVW.W R0, #16534

In reference manual arm architecture v7m, I couldn't find about instruction MOVW.W, only MOV.W.

Why MOVW.W appears?

I'm using TM4C123GH6PGE board.