code: def MOVT(cpu, dest, src):
          
          assert src.type == 'immediate'
          imm = src.read()
          low_halfword = dest.read() & Mask(16)
          dest.write((imm << 16) | low_halfword)
docs: MOVT writes imm16 to Rd[31:16]. The write does not affect Rd[15:0].
  
          :param Armv7Operand dest: The destination operand; register
          :param Armv7Operand src: The source operand; 16-bit immediate