单片机课程设计 (51单片机实现电子时钟)(18)

用51单片机的最小系统和LCD1602显示的电子时钟

month=1; write_nyr(5,month); WriteInstruction(0x80+6); } if(s1num==6) //年加一 { year++; if(year==99) year=0; write_nyr(2,year); WriteInstruction(0x80+3); } if(s1num==7) //星期加一 { week++; if(week==8) week=1; write_week(15,week); WriteInstruction(0x80+15); } } }

if(s3==0) //第三个键被按下 { delay(5); if(s3==0) { while(!s3); if(s1num==1) //秒减一 { second--; if(second==-1) second=59; write_sfm(12,second); WriteInstruction(0x80+0x40+13); } if(s1num==2) //分减一 { minute--; if(minute==-1) minute=59; write_sfm(9,minute); WriteInstruction(0x80+0x40+10); }