单片机上机操作考试题部分答案

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1、I.使得8个发光二极管循环点亮，采用定时器方式0使得每个发光二极管点亮的时间为0.5$oD1U1R1189293031••••••12345678伯^XTAL1P0.0/AD0P0.1/AD1P0.2/AD2XTAL2P0.3/AD3P0.4/AD4P0.5/AD5P0.6/AD6RSTP0.7/AD7P2.0//J8P2A/PQP2.2/A10PSENP2.3/A11ALEP2.4/A12EAP2.5/A13P2.6/A14P2.7/A15P1.0P3.0/RXDP1.1P3.1/TXDP1.2P3.2/IN

2、T0P1.3P3.3/INT1P1.4P3.4/T0P1.5P3.5/T1P1.6P3.6/WRP1.7P3.7/RDAT89C51•GREENXT>.•220・・R2・・・・囲・GREENa>.・220・・cTCXflR3・・21222324252627281011121314151617-GREENKT>・・220・・::TEXT>R4・・-GREEN・・220・・R5・・220・・•GREEN令R6•GREEN220・・R7・・220・・-GREEN・&"•・・R8・・

3、220・・LED-GREEN・xTCYTx#include#include#defineucharunsignedcharucharT_count=0;〃定时中断voidtoProc()interruptl{TH0=(8192-5000)/32;〃恢复初值TL0=(8192-5000)%32;if(++T_count==100)//0.5s移动一位{P0=_crol_(P0J);T_count=0;}}〃主函数voidmain()TMOD=0;TH0=(819

4、2-5000)/32;//5ms定吋TL0=(8192・5000)%32;EA=1;ET0=l;TR0=l;P0=0xfe;while(l);}2•完成下面电路所示的功能，KI,K2对应两个开关按键。P1口对应发光二极管的状态•U120—38_37_D13Z_GREEN•GREENK1LED・GREENAT8Q.C51J2・令・・・囲・GREEH一FK2t.•P0.0/AD0XTAL1

5、/AD7RSTP2.0/A6P2.1//®P2.2/A10P2.3/A11PSENP2.4/A12ALEP2.5/A13EAP2.6/A14P2.7/A15P3.0/RXDP1.0P3.1/TXDR1.1P32INT0P1.2P3.3/INT1R1.3P3.4/TODO氏,T4P1.4ro.O/11P3.6WRr1.0P1.6P3.7/RDP1.72Z_1b1710112223GREENR1•GREEN220・・・R430-21o一522・r•GREEN刑GREEHT>■卜220・220・•

6、T>Pl.0Pl.IPl.2Pl.3Pl.4Pl.5Pl.6Pl.7Kl=0,K2=0OoOOOOOoKl=0,K2=l••••oOOoKl=l,K2=0••oo••ooKl=l,K2=l••••••••#include#defineuintunsignedint#defineucharunsignedcharsbitkl二P3"2;sbitk2二P3"3;//延时voiddelay(uintx)uchari;while(--x){for(i=0;i<120;i++);〃主函数voidrnai

7、riO{while(1){if((kl==0)&&(k2==0)){Pl二0x00;delay(10);}elseif((k1==0)&&(k2==1)){Pl二Oxcc;delay仃0);}elseif((k1==1)&&(k2==0)){Pl二OxfO;delay(10);}else{Pl=0xff;delay仃0);//KI、K2同时按下//KI按下，K2不按//K2按下,K1不按3.在一个数码管上循环显示“H”“E”“L”“L”“0”，循环的时间为Is。U1>XTAL1XTAL2RSTPSENALEEA

8、AT89C51RP1RESPACK-8182930312345B78P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7PO.OXADOPO.1/AD1P0.2/AD2P0.3/AD3PO.4/AD4P0.5XAD5P0.6/AD6P0.7/AD7P2.0W6P2.2/A10P2.3/A11P2.4/A12P2.5/A13P2.6/A14P2.7/A15P3.0