1.1.1 ˫

来自「51单片机开发应用的程序」· 1 ˫ 代码 · 共 22 行

DADD:
MOV	R4,#00H					
MOV	R5,#40H					
MOV	R6,#60H					
MOV	R7,#01H				
MOV	20H,R4
MOV	21H,R5
CLR		C
MOV	A,R4
ADD		A,20H					
MOV	20H,A
MOV	A,R5
ADDC	A,21H
JB		D2,LOOP					
MOV	R4,20H					
MOV	R5,21H					
RET								
LOOP:
MOV	R4,#0FFH					
MOV	R5, #0FFH	
RET