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引脚定义
//LCD1602 IO设置
LCD1602_RS = P2^5;
LCD1602_RW = P2^6;
LCD1602_EN = P2^7;
/DS1302 IO设置
sbit DS1302_RST = P1^2; //实时时钟复位线引脚
sbit DS1302_IO = P1^1; //实时时钟数据线引脚
sbit DS1302_CLK = P1^0; //实时时钟时钟线引脚
//DS18B20 IO设置
sbit DS18B20_DQ = P1^3;
//按键 IO设置
sbit KEY1 = P3^2;
sbit KEY2 = P3^3;
sbit KEY3 = P3^4;
sbit KEY4 = P3^5;
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