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1、#include #define XTAL 11059200 / CPU晶振频率#define baudrate 9600 / 通信波特率#define uchar unsigned char#define uint unsigned intsbit K1 = P10; / 定义端口sbit K2 = P11;void init(void) SCON = 0x50; / 设定串行口工作方式 PCON &= 0x00; / 波特率不倍增 TMOD = 0x20; / 定时器1工作于8位自动重载模式, 用于产生波特率 TH1 = (unsigned char)(256 - (XTAL / (32L
2、 * 12L * baudrate); TL1 = (unsigned char)(256 - (XTAL / (32L * 12L * baudrate); / T1赋初值 TR1 = 1; / 启动定时器1 IE = 0x00; / 禁止任何中断/ EA = 1; / 中断总允许/-void main(void) init(); while(1) while(RI = 0); RI = 0; if (SBUF = 0x01) K1 = 1; if (SBUF = 0x03) K2 = 1; if (SBUF = 0x07) K1 = 0; K2 = 0; /=图中的下位机，要完成输入的检测
3、，并发送不同的串行数据。使用的程序如下：/=#include #define XTAL 11059200 / CPU晶振频率#define baudrate 9600 / 通信波特率#define uchar unsigned char#define uint unsigned intsbit K1 = P10; / 定义端口sbit K2 = P11;/-void init(void) SCON = 0x50; / 设定串行口工作方式 PCON &= 0x00; / 波特率不倍增 TMOD = 0x20; / 定时器1工作于8位自动重载模式, 用于产生波特率 TH1 = (unsigned
4、char)(256 - (XTAL / (32L * 12L * baudrate); TL1 = (unsigned char)(256 - (XTAL / (32L * 12L * baudrate); / T1赋初值 TR1 = 1; / 启动定时器1 IE = 0x00; / 禁止任何中断/ EA = 1; / 中断总允许/-void main(void) bit T_1 = 0, T_2 = 0, T_3 = 0; init();/- while(1) if (K1 = 0) & (T_1 = 0) T_1 = 1; T_3 = 0; SBUF = 0x01; while(TI = 0); TI = 0; /- if (K2 = 0) & (T_2 = 0) T_2 = 1; T_3 = 0; SBUF = 0x03; while(TI = 0); TI = 0; /- if (K1 = 1) & (K2 = 1) & (T_3 = 0) T_1 = 0; T_2 = 0; T_3 = 1; SBUF = 0x07; while(TI = 0); TI = 0;
