用两个74HC164驱动两个四位的数码管.doc

用两个74HC164驱动两个四位的数码管（一个简易电子钟）几天前我发一了帖寻求用两74HC164做动态扫描数码管 今天我折腾了一天终于把它难弄出来了其电路图是在一本书上找到的由于还没学会用protel 99画图，所以就只有将就一下了我的程序如下：#includesbit DAT=P11;sbit CLK=P12; unsigned char code tab=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40;/ 显示09unsigned char code ff=0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x77;/位选;unsigned char a,b,c,d,e,f,ch,hour,minite,second;/开启计时void loading() TMOD=0x22; TR0=1; ET0=1; EA=1;以下是显示程序,共八个,因为有八个数码管;void sendbyte(unsigned char byte) unsigned char num,c; num=tabbyte; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; num=0xfe; for(c=0;c8;c+) CLK=0; DAT=num; CLK=1; num=1; void sendbyte_1(unsigned char byte) unsigned char num,c; num=tabbyte; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; num=0xfd; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; void sendbyte_2(unsigned char byte) unsigned char num,c; num=tabbyte; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; num=0xfb; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; void sendbyte_3(unsigned char byte) unsigned char num,c; num=tabbyte; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; num=0xf7; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; void sendbyte_4(unsigned char byte) unsigned char num,c; num=tabbyte; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; num=0xef; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; void sendbyte_5(unsigned char byte) unsigned char num,c; num=tabbyte; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; num=0xdf; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; void sendbyte_6(unsigned char byte) unsigned char num,c; num=tabbyte; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; num=0xbf; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; void sendbyte_7(unsigned char byte) unsigned char num,c; num=tabbyte; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; num=0x7f; for(c=0;c8;c+) CLK=0; DAT=num&0x80; CLK=1; num=1; /延时void delay() unsigned int j; for(j=0;j250;j+) ;main() loading(); while(1) a=hour/10; b=hour%10; c=minite/10;d=minite%10; e=second/10;f=second%10; ch=10; sendbyte(f); delay(); sendbyte_1(e); delay(); sendbyte_2(ch); delay(); sendbyte_3(d); delay(); sendbyte_4(c); delay(); sendbyte_5(ch); delay(); sendbyte_6(b); delay(); sendbyte_7(a); delay(); void time(void) interrupt 1 unsigned int tt; tt+; if(tt=3600) tt=0; seco