TL0=(65536-50000)%6; EA= 1; ET0= 1; TR0=0; while( 1) {
if(number_display!=0) Play(number_display/2); //蜂鸣器发声 start_stop_keyscan(); reset_keyscan(); while(action) {
while(!key_scan8()) {
display(number_display,second); if(second == 0) {
second = 20; break; } } TR0 = 0;
30
?
display(number_display,second); action = 0; break; }
display(number_display,second); } }
//中断服务函数 void timer0() interrupt 1 { // uint i;
TH0=(65536-50000)/256; TL0=(65536-50000)%6; timer0_count ++; if(timer0_count == 20) {
timer0_count = 0; second --; if(second == 0) { Play(2); TR0 = 0;
31
number_display = 0; state = 1; action = 0; } } }
2.所需器件列表 名称 STC89C52 四角开关 四位共阴数码管 无缘蜂鸣器 三极管 红色LED 12M晶振 电容10nf 电容30Pf
件数 1个 10个 1个 1个 1个 1个 1个 1个 2个
32