单片机原理与C51程序设计基础教程 教学课件 作者 978 7 302 23075 5 第12章.docVIP

填空题 1. 双键互锁方式和N键巡回方式 2．动态 静态 3．直插式 贴片式 4. 中断方式 5. 段控信号 位控信号 选择题 1．b 2．c 3．AB 4．B 5 B 上机题 １. #include reg51.h unsigned char code TAB[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff}; char disp[2][4]={{2 0 0 8},{0 3 1 5}}; void delay1ms(int); void scanner(char); main() { char i; while(1) { for(i=0;i2;i++) { scanner(i); P1=0xff; delay1ms(480); } } } void delay1ms(int x) { int i,j; for(i=0;ix;i++) for(j=1;j=120;j++); } void scanner(char x) { char i,j,BCD,scan; for(i=0;i30;i++) { scan=0xf7; for(j=0;j4;j++) { p2=0xff; P1=scan; BCD=disp[x][j]; P2=TAB[BCD]; delay1ms(4); scan=1; } } } 2. #include reg51.h #define SEG P2 #define SCANP P1 sbit LED=P0^; #define count_M1 50000 #define TH_M1 (65536-COUNT_M1)/256 #define TH_M1 (65536-COUNT_M1)%256 int count_T0=0; #define count_M2 250 #define TH_M2 (256-count_M2) unsigned char code TAB[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff}; char disp[2]={0xc0,0xc0}; char seconds=0; char scan=0; main() { IE=0X8A; TMOD=0X21; TH0=TH_M1;TL0=TL_M1; TR0=1; TH1=TH_M2;TL0=TL_M2; TR1=1; LED=1; while(1); } void T0 1s(void) interrupt 1 { TH0=TH_M1;TL0=TL_M1; if(++count_T0==20) { count_T0=0; seconds++; if(++count_T0==20) { count_T0=0; seconds++; if(seconds==60) { seconds=0; LED=~LED; } } disp[1]=TAB[second/10]; disp[0]=TAB[second%10]; } } void T1_8ms(void) interrupt3 { if(++count_T1==32) { count_T1=0; if(++scan==3)scan=1; SEG=0XFF; SCANP=~scan; SEG=disp[scan-1]; } } 3． #include reg51.h unsigned char code TAB[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff}; #define counts 6 char disp[counts+7]={10,10,10,10,1,2,3,4,5,6,10,10,10}; void delay1m(int); void scanner(char); main() { char i; while(1) for(i=0;icounts;i++) scanner(i); } void delay1m(int x) { int i,j; for(i=0;ix;i++) for(j=1;j=120;j++) } void scanner(char x) { char i,j,BCD,scan; for(i=0;i30;i++) { scan=0x