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/*利用数码管在最高为显示数字0，利用按键执行中断控制数字加减*/ /*和上次写的中断控制左右移动几乎相同，只是把控制位选改为段选*/ /*以下为我利用手头上的开发板（QX-MCS51）写下的小程序*/ #include  #define u8 unsigned char #define u16 unsigned int sbit DU = P2^6; sbit WE = P2^7; sbit S2 = P3^0; sbit S3 = P3^1; sbit jia = P3^6; sbit jian = P3^7; u8 SMGdu[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; u8 j; void Delay_ms(u16 n) { u8 j; while(n--) for(j=0;j<113;j++); } void SMGHS() { P0 = 0xff; WE = 1; P0 = 0x7f; WE = 0; DU = 1; P0 = SMGdu[j]; DU = 0; Delay_ms(10); } void Init() { EA = 1; EX0 = 1; EX1 = 1; IT0 = 1; IT1 = 1; } void main() { while(1) { Init(); SMGHS(); if(S2 == 0) { Delay_ms(10); if(S2 == 0) { jia = 1; jia = 0; while(S2 == 0); } } if(S3 == 0) { Delay_ms(10); if(S3 == 0) { jian = 1; jian = 0; while(S3 == 0); } } } } void int0() interrupt 0 { j++; if(j == 10) j = 0; } void int1() interrupt 2 { j--; if(j == -1) j = 9; }