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#include<reg51.h> #define LED P1 unsigned cnt=0,sec=0; main() {TMOD=1; TH0=0x3c; TL0=0xB0; EA=1;ET0=1;EX0=1;EX1=1; TR0=0; IT0=1;IT1=1; while(1) {LED=((sec/10)<<4)+(sec%10); } } void t_0(void)interrupt 1 {TH0=0x3C; TL0=0xB0; if(++cnt==20) {cnt=0; sec++; } } void int_0(void)interrupt 0 { TR0=!TR0; } void int_1(void)interrupt 2 { sec=0; } TI #include<reg51.h> #define LED P1 unsigned cnt=0,sec=0; main() {TMOD=0x10; TH1=0x3c;TL1=0xb0; EA=1; ET1=1; EX0=1;EX1=1; TR1=0; IT0=1;IT1=1; while(1) {LED=((sec/10)<<4)+(sec%10); } } void t_1(void)interrupt 3 {TH1=0x3C; TL1=0xb0; if(++cnt==20) {cnt=0; sec++; } } void int_0(void)interrupt 0 { TR1=!TR1; } void int_1(void)interrupt 2 { sec=0; }