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1.引用头文件的两种方式
#include <reg52.h>
#include "reg52.h"区别:优先搜索的位置不同!
在keil软件中
#include <reg52.h> 优先搜索软件安装的INC文件夹
#include "reg52.h" 优先搜索当前工程文件夹下的头文件,如果没有,则在软件安装的INC文件夹下搜索头文件
2.如何方便地打开头文件
光标定位到头文件处,右击打开
3.reg52.h内容
#ifndef __REG52_H__
#define __REG52_H__/* BYTE Registers 8位寄存器 */
sfr P0 = 0x80;
sfr P1 = 0x90;
sfr P2 = 0xA0;
sfr P3 = 0xB0;
sfr PSW = 0xD0;
sfr ACC = 0xE0;
sfr B = 0xF0;
sfr SP = 0x81;
sfr DPL = 0x82;
sfr DPH = 0x83;
sfr PCON = 0x87;
sfr TCON = 0x88;
sfr TMOD = 0x89;
sfr TL0 = 0x8A;
sfr TL1 = 0x8B;
sfr TH0 = 0x8C;
sfr TH1 = 0x8D;
sfr IE = 0xA8;
sfr IP = 0xB8;
sfr SCON = 0x98;
sfr SBUF = 0x99;/* 8052 Extensions 8052拓展部分 */
sfr T2CON = 0xC8;
sfr RCAP2L = 0xCA;
sfr RCAP2H = 0xCB;
sfr TL2 = 0xCC;
sfr TH2 = 0xCD;/* BIT Registers 位寄存器(合起来为标志寄存器 Flags Register) */
/* PSW */
sbit CY = PSW^7;
sbit AC = PSW^6;
sbit F0 = PSW^5;
sbit RS1 = PSW^4;
sbit RS0 = PSW^3;
sbit OV = PSW^2;
sbit P = PSW^0; //8052 only/* TCON 定时器控制 */
sbit TF1 = TCON^7;
sbit TR1 = TCON^6;
sbit TF0 = TCON^5;
sbit TR0 = TCON^4;
sbit IE1 = TCON^3;
sbit IT1 = TCON^2;
sbit IE0 = TCON^1;
sbit IT0 = TCON^0;/* IE 中断允许 */
sbit EA = IE^7;
sbit ET2 = IE^5; //8052 only
sbit ES = IE^4;
sbit ET1 = IE^3;
sbit EX1 = IE^2;
sbit ET0 = IE^1;
sbit EX0 = IE^0;/* IP 中断优先级 */
sbit PT2 = IP^5;
sbit PS = IP^4;
sbit PT1 = IP^3;
sbit PX1 = IP^2;
sbit PT0 = IP^1;
sbit PX0 = IP^0;/* P3 端口3 */
sbit RD = P3^7;
sbit WR = P3^6;
sbit T1 = P3^5;
sbit T0 = P3^4;
sbit INT1 = P3^3;
sbit INT0 = P3^2;
sbit TXD = P3^1;
sbit RXD = P3^0;/* SCON 串行口控制 */
sbit SM0 = SCON^7;
sbit SM1 = SCON^6;
sbit SM2 = SCON^5;
sbit REN = SCON^4;
sbit TB8 = SCON^3;
sbit RB8 = SCON^2;
sbit TI = SCON^1;
sbit RI = SCON^0;/* P1 端口1 */
sbit T2EX = P1^1; // 8052 only
sbit T2 = P1^0; // 8052 only/* T2CON */
sbit TF2 = T2CON^7;
sbit EXF2 = T2CON^6;
sbit RCLK = T2CON^5;
sbit TCLK = T2CON^4;
sbit EXEN2 = T2CON^3;
sbit TR2 = T2CON^2;
sbit C_T2 = T2CON^1;
sbit CP_RL2 = T2CON^0;#endif备注:,sfr(定义特殊功能寄存器) sbit(定义特殊功能寄存器的位变量)
定义格式: sfr 特殊功寄存器名 = 地址;
sbit 寄存器名 = 寄存器^数字;
如:
sfr P0 = 0x80;
sbit CY = PSW^7;定义特殊功能寄存器P0地址值为0x80(P0的值为0x80处地址的值)
定义位寄存器CY为PSW的第7位