51单片机为基础用汇编语言编写用数码管显示一个同时有"加""减""乘...答:ORG 0000H LJMP MAIN ORG 0100H MAIN:MOV SP,#7EH MOV 22H,#00H CLR P2.0 CLR P2.3 MOV 20H,#00H MOV 21H,#00H MOV 30H, #00H MOV 31H, #00H MOV 32H, #00H ;初始化 SU: MOV 7DH,#0FFH MOV 7EH,#0FFH MOV 7FH,#0FFH KEYI:ACALL KS1 CJNE A,#0F0H,LK1 ACALL ...