ds1302读数据偶数值出错 数据年月日时分秒只要是偶数都不正确，奇数就正常

最后发现只要接上显示器测CLK时钟引脚所有读写都正常，不接就不正常·

你好！把你程序和原理图发一下看看，找找原因

void ds1302inputbyte(unsigned char d) //实时时钟写入一字节(内部函数) { unsigned char i; acc = d; for(i=8; i>0; i--) { ds1302_io = acc0; //相当于汇编中的 rrc ds1302_clk = 1; ds1302_clk = 0; acc = acc >> 1; } } unsigned char ds1302outputbyte(void) //实时时钟读取一字节(内部函数) { unsigned char i; for(i=8; i>0; i--) { acc = acc >>1; //相当于汇编中的 rrc acc7 = ds1302_io; ds1302_clk = 1; ds1302_clk = 0; } return(acc); } void write1302(unsigned char ucaddr, unsigned char ucda) //ucaddr: ds1302地址, ucdata: 要写的数据 { ds1302_rst = 0; ds1302_clk = 0; ds1302_rst = 1; ds1302inputbyte(ucaddr); // 地址，命令 ds1302inputbyte(ucda); // 写1byte数据 ds1302_clk = 1; ds1302_rst = 0; } unsigned char read1302(unsigned char ucaddr) //读取ds1302某地址的数据 { unsigned char ucdata; ds1302_rst = 0; ds1302_clk = 0; ds1302_rst = 1; ds1302inputbyte(ucaddr|0x01); // 地址，命令 ucdata = ds1302outputbyte(); // 读1byte数据 ds1302_clk = 1; ds1302_rst = 0; return(ucdata); } void ds1302_setprotect(bit flag) //是否写保护 { if(flag) write1302(0x8e,0x10); else write1302(0x8e,0x00); } void ds1302_settime(unsigned char address, unsigned char value) // 设置时间函数 { ds1302_setprotect(0); write1302(address, ((value/10)<<4 | (value%10))); } void ds1302_gettime(systemtime *time) { unsigned char readvalue; readvalue = read1302(ds1302_second); time->second = ((readvalue&0x70)>>4)*10 + (readvalue&0x0f); readvalue = read1302(ds1302_minute); time->minute = ((readvalue&0x70)>>4)*10 + (readvalue&0x0f); readvalue = read1302(ds1302_hour); time->hour = ((readvalue&0x70)>>4)*10 + (readvalue&0x0f); readvalue = read1302(ds1302_day); time->day = ((readvalue&0x70)>>4)*10 + (readvalue&0x0f); readvalue = read1302(ds1302_week); time->week = ((readvalue&0x70)>>4)*10 + (readvalue&0x0f); readvalue = read1302(ds1302_month); time->month = ((readvalue&0x70)>>4)*10 + (readvalue&0x0f); readvalue = read1302(ds1302_year); time->year = ((readvalue&0x70)>>4)*10 + (readvalue&0x0f); } void datetostr(systemtime *time) { time->datestring[0] = time->year/10 + '0'; time->datestring[1] = time->year%10 + '0'; time->datestring[2] = '-'; time->datestring[3] = time->month/10 + '0'; time->datestring[4] = time->month%10 + '0'; time->datestring[5] = '-'; time->datestring[6] = time->day/10 + '0'; time->datestring[7] = time->day%10 + '0'; time->datestring[8] = '\0'; } void timetostr(systemtime *time) { time->timestring[0] = time->hour/10 + '0'; time->timestring[1] = time->hour%10 + '0'; time->timestring[2] = ':'; time->timestring[3] = time->minute/10 + '0'; time->timestring[4] = time->minute%10 + '0'; time->timestring[5] = ':'; time->timestring[6] = time->second/10 + '0'; time->timestring[7] = time->second%10 + '0'; time->datestring[8] = '\0'; } void initial_ds1302(void) { unsigned char second=read1302(ds1302_second); if(second&0x80) ds1302_settime(ds1302_second,0); } 参考这个