/* const/16 vAA, #+BBBB */
    FETCH_S r0, 1                       @ r0<- ssssBBBB (sign-extended)
    mov     r3, rINST, lsr #8           @ r3<- AA
    FETCH_ADVANCE_INST 2                @ advance rPC, load rINST
    SET_VREG r0, r3                     @ vAA<- r0
    GET_INST_OPCODE ip                  @ extract opcode from rINST
    GOTO_OPCODE ip                      @ jump to next instruction