項(xiàng)目——電子鬧鐘和開關(guān)電源控制器單元測(cè)試三答案

1、1、具有人機(jī)對(duì)話功能。實(shí)現(xiàn)人對(duì)應(yīng)用系統(tǒng)的狀態(tài)干預(yù)和數(shù)據(jù)輸入以及應(yīng)用系統(tǒng)向人報(bào)告運(yùn)行和運(yùn)行結(jié)果。2、（1）判斷鍵盤上是否有鍵閉合（2）去除鍵的機(jī)械抖動(dòng)，再次判斷鍵盤是否有鍵閉合。（3）鍵盤掃描取得閉合鍵的行列值，通常采用掃描法。（4）求取閉合鍵的鍵號(hào)（5）判斷閉合鍵是否釋放，如未釋放繼續(xù)等待。（6）將閉合鍵鍵號(hào)保存，同時(shí)轉(zhuǎn)去執(zhí)行該閉合鍵的功能。3、#include#define uchar unsigned charuchar code dispcode=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0

2、x79,0x71,0x40;uchar code keytab=0x28,0x14,0x24,0x44,0x12,0x22,0x42,0x11,0x21,0x41,0x81,0x82,0x84,0x88,0x48,0x18;uchar code disbit=0x40,0x80;uchar disbuf=0,0;void delay5ms();bit Keytest();void display(uchar x) ;uchar GetKeyNum();void main() uchar Keynum=0;TMOD=0X10;TR1=1;P2=0;while(1) if( Keytest() K

3、eynum=GetKeyNum(); display(Keynum);void delay5ms() TH1=(65536-5000)/256;TL1=(65536-5000)%256;while(!TF1);TF1=0;void display(uchar x) /顯示 uchar ii; if(x=16) disbuf0=dispcodex; disbuf1=dispcodex; else disbuf0=dispcodex/10;disbuf1=dispcodex%10; for(ii=0;ii2;ii+) P0=0x0; if(disbufii=0x3f)&(ii1) P0=0x0;e

4、lse P0=disbufii;P2=disbitii;delay5ms();P2=0; bit Keytest()、/判斷是否 有鍵按下、 uchar temp;P1=0xf0;temp=P1;temp&=0xf0;if(temp=0xf0)return 0;else return 1 ; uchar GetKeyNum() /掃描法求鍵號(hào) uchar i,j=1,k;if(Keytest() delay5ms(); if(Keytest() j=0x01; /行線送掃描初始值 for(i=0;i4;i+) P1=j; /掃描值送P1口 k=P1; /讀P1口狀態(tài)k=k&0xf0; /K中保

5、留高四位低四位清零if(k!=0) break;/如果K!=0則列線有輸入，退出循環(huán) j=j1; k=k+j; while(Keytest() ; /按鍵釋放 for(i=0;i16;i+) if(keytabi=k)break; 搜索/搜索編碼，獲得鍵號(hào) return(i) ;/返回鍵號(hào)4、靜態(tài)：一個(gè)數(shù)碼管需要8條I/O口線，N個(gè)數(shù)碼管就需要8N條I/O口線。當(dāng)單片機(jī)的I/O口數(shù)據(jù)線足夠用時(shí)、對(duì)數(shù)碼管的亮度要求較高時(shí)選用。 動(dòng)態(tài)：一個(gè)數(shù)碼管位選需要1條I/O口線，段選需要8條I/O口線。N個(gè)數(shù)碼管需要（N+8）條I/O口線。利用發(fā)光管的余輝和人眼視覺(jué)暫留作用，使人感覺(jué)好像各位數(shù)碼管同時(shí)都在顯

6、示。當(dāng)單片機(jī)的I/O口數(shù)據(jù)線不夠用時(shí)、對(duì)電路成本要求低、對(duì)數(shù)碼管亮度要求不高時(shí)選用。5、#include#define uchar unsigned charuchar code dispcode=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xb7,0xbfuchar code disbit=0x0e,0x0d,0x0b,0x07;sbit K13=P24;sbit K14=P25;sbit K15=P26;sbit K16=P27;uchar keycnt1=0,keycnt2=0,keycnt3=0，keycnt4=0;void m

7、ain() while(1) if(!K13) keycnt1+; if(keycnt1=10) keycnt1=0;while(!K13);P0=dispcodekeycnt1;P2=disbit0;if(!K14) keycnt2+; if(keycnt2=10) keycnt2=0; while(!K14); P0=dispcodekeycnt2;P2=disbit1; if(!K15) keycnt3+; if(keycnt3=10) keycnt3=0; while(!K15); P0=dispcodekeycnt3;P2=disbit2; if(!K16) keycnt4+; if

8、(keycnt4=10) keycnt4=0; while(!K16); P0=dispcodekeycnt4;P2=disbit3; 6、#include #define uchar unsigned char sbit LED=P16; void main() TMOD=0X10; LED=1; while(1) TH1=0XCO; TL1=0X63; TR1=1; while(!TF1); TF1=0; LED=LED;7、中斷向量入口地址，外部中斷0為0003H，定時(shí)器0為000BH，外部中斷1為0013H，定時(shí)器1為001BH，串行端口為0023H。8、電平觸發(fā)：判斷n個(gè)周期的采樣是否都為同一個(gè)值，且這個(gè)值是你的設(shè)定觸發(fā)電平，則執(zhí)行指令。邊沿觸發(fā)：判斷相鄰2個(gè)周期的采樣是否不同，假設(shè)有高低電平A,B，如果你設(shè)定A-B執(zhí)行指令，則稱為下降沿觸發(fā)；否則