资源描述:
《单片机汇编键盘扫描程序.doc》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、单片机——汇编——键盘扫描程序键盘接口如图:显示P0口数码管选择P2口LEDEQUP0KEYEQUP1DUANEQUP2QIANEQU30HHOUEQU40HXSEQU50HORG00HLJMPSTART;***************************ORG30HSTART:MOVR0,#50HL1:CLRAMOV@R0,AINCR0CJNER0,#58H,L1MOVDPTR,#SJL2:MOVR0,#50HMOVR2,#00HL3:MOVA,@R0MOVLED,AMOVDUAN,R2LCALLDELAYINCR0INCR2MOVKEY
2、,#0FHJNBP1.0,S1JNBP1.1,S1JNBP1.2,S1JNBP1.3,S1CJNER2,#08H,L3LJMPL2;********************************S1:MOVR5,#10;延时20ms去抖DELAY2:LCALLDELAYDJNZR5,DELAY2MOVB,#00HMOVKEY,#0FHJNBP1.0,S0INCBJNBP1.1,S0INCBJNBP1.2,S0INCBJNBP1.3,S0LJMPL2S0:LCALLSAOLJMPL2SAO:;键盘输入子程序CLRAMOVKEY,#0F0HJNB
3、P1.4,FZ0INCAJNBP1.5,FZ0INCAJNBP1.6,FZ0INCAJNBP1.7,FZ0RETFZ0:PUSHACCFZ1:MOVKEY,#0FHMOVA,KEYNOPCJNEA,#0FH,FZ1POPACCRLARLAADDA,BMOVCA,@A+DPTRMOV58H,AMOVR0,#50HMOVR1,#51HLOOP0:MOVA,@R1MOV@R0,AINCR0INCR1CJNER0,#58H,LOOP0RETDELAY:;延时2ms子程序MOVR7,#10DELAY1:MOVR6,#100DJNZR6,$DJNZR7,D
4、ELAY1RETSJ:DB06H,5BH,4FH,77H,66H,6DH,7DH,7CH,07H,7FH,6FH,39H,79H,3FH,71H,5EHEND