4810.asm

单片机开发资料光盘-双龙-686M.zip

   .include "m103def.inc"
    .org  $0000
    rjmp  RESET
   .cseg  
    .org  $0010
  RESET:ldi   r16,6/5
        mov   r20,r16
        ldi   r17,2*2
        mov  r21,r17    
         
         mulsu r21,r20     ; 有符号数r21和无符号数r20相乘得有符号数结果。
         movw r20,r0       ; 拷贝结果回 r21:r20