单片机按钮开关控制 用汇编语言编程和Proteus画图用AT89C51不加7447_百...答:KEY0EQU0X20 ORG0 MAIN:MOVKEY0,#0 MOVLED,#0X03 KEYSCAN:MOVA,P3 CJNEA,#0XFF,KEY_1 AJMPKEYSCAN RET KEY_1:CJNEA,#0XFE,KEY_2 MOVKEY0,#0X01 ACALLDISPLAY AJMPKEY_RES KEY_2:CJNEA,#0XFD,KEY_3 MOVKEY0,#0X02 ACALLDISPLAY AJMPKEY_RES KEY_3:CJNEA,#0XFB,KEY_4 MOVKEY0...