ORG		00H
		MOV	30H,#12H
		MOV	31H,#44H
		MOV	32H,#89H

		MOV		R7,#03H
		MOV		R0,#30H
NEG: 	MOV 	A,R7		;?。ㄗ止?jié)數(shù)減一）至R2中 
		DEC 	A 
		MOV 	R2,A 
		MOV 	A,R0		;保護(hù)指針 
		MOV 	R3,A 
NEG0: 	CLR 	C 
		MOV 	A,#99H 
		SUBB 	A,@R0		;按字節(jié)十進(jìn)制取補(bǔ) 
		MOV 	@R0,A		;存回[R0]中 
		INC 	R0			;調(diào)整數(shù)據(jù)指針 
		DJNZ 	R2,NEG0		;處理完（R2）字節(jié) 
		MOV 	A,#9AH		;最低字節(jié)單獨(dú)取補(bǔ) 
		SUBB 	A,@R0 
		MOV 	@R0,A 
		MOV 	A,R3		;恢復(fù)指針 
		MOV 	R0,A 
		SJMP	$
		END