lab3.asm

运用simulator软件

************************************************
* lab3.asm      y= a1*x1+a2*x2+a3*x3+a4*x4     *
************************************************
        .title   "lab3.asm"
        .mmregs
STACK   .usect   "STACK",10h      ;allocate space for stack
        .bss     a,4              ;allocate 9 word for variates
        .bss     x,4                              
        .bss     y,1
        .def     start
;       .def     INT_2
        .data
        .mmregs
table:  .word    1,2,3,4          ;data follows ...
        .word    8,6,4,2
        .text                     ;code follows ...
start:  STM      #0,SWWSR         ;adds no wait states
        STM      #STACK+10h,SP    ;set stack pointer
;        RSBX     INTM
;        STM      #0004h,IMR
        STM      #a,AR1           ;AR1 point to a
        RPT      #7               ;move 8 values
        MVPD     table,*AR1+      ;from program memory
                                  ;into data memory
        CALL     SUM              ;call SUM subrotine
end:    B        end
;INT_2:  NEG A
;        RETE
SUM:    STM      #a,AR3           ;The subrotine lmplememt
        STM      #x,AR4           ;multiply--accumulate
        RPTZ     A,#3
        MAC      *AR3+,*AR4+,A
        STL      A,@y
        RET
       .end