四字节除法汇编程序 四字节除法汇编程序 四字节除法汇编程序

四字节除法程序 

默认分类   2007-05-04 04:18   阅读13   评论0   字号： 大大  中中  小小 四字节除法程序 


           MOV   SP,#70H

LOOP0:    MOV 0CH, #00h    ;除数低字节

          MOV 0DH, #00h

          MOV 0EH, #061h    ;除数高字节

          MOV 0FH, #0A8H

          MOV 08H, #01H

          MOV 09H, #0C9H

          MOV 0AH, #0C3H

          MOV 0BH, #080H

          ACALL   CHU40

          RET

;4字节除4字节商为4字节除法子程序CHU40

;被除数放在内部08H.09H.0AH.0BH 单元中,除数放在0C.0D.0E.0F单元中

;商数放在内部R4.R5.R6.R7单元中,余数放在10H.11H.12H.13H单元中.

;溢出时商为零。余数为被除数

;资源影响；R0--16H共24字节   PSW      运行总时间1.977毫秒

CHU40:    MOV R0, #20H

          MOV 10H, #00H

          MOV 11H, #00H

   MOV 12H, #00H

          MOV 13H, #00H

CHU47:    CLR C

          MOV A, 0BH

          RLC A

          MOV 0BH, A

          MOV A, 0AH ;被除和扩充位左移

          RLC A

          MOV 0AH, A