两片51单片机互相通信的串行通信程序(一个发送程序,一个接收程序)

;此程序在硬件上测试通过
;2007-05-27
;附有简化电路图
;为了使初学者能看懂，程序与图尽可能的简单扼要

;实验现象为，发送端的P1口的哪个键被接下，接收端的哪个灯对应着亮
;如果把两个 单片机 的T和R通过无线模块（如基于MCP2120芯片的模块）来扩充，便可做成无线通信
                    ORG                 0000H
                    AJMP                START
                    ORG                 0040H
START:
                    MOV                 SP,#60H       
                    MOV                 SCON,#50H                   ;串口 方式 1
                    MOV                 TMOD,#20H                   ;T1 方式2

                    MOV                 TL1,#0FDH                   ;波特率 9600 的常数
                    MOV                 TH1,#0FDH
                    SETB                TR1  
                    mov                 r5,#00h                   
WAIT:
                    mov               p1,#0ffh
                    mov               a ,p1
                    mov               r5,a
                    lcall delay                      ;读键盘，这里去抖动，还要加几句话
                    mov               a ,p1
                     nop
                    CJNE                A,5,WAIT                ;是否有键输入
                    MOV                 SBUF,a                      ;串口输出键盘输入的值
                    NOP
SS:                 JBC                 TI,WAIT                     ;是否发送完毕
                    SJMP                SS
DELAY:                                      ;延时子程序
                    PUSH                0                           ;保存现场
                    PUSH                1
                    MOV                 0,#06H
DELAY1: MOV                 1,#0H
                    DJNZ                1,$
                    DJNZ                0,DELAY1
                    POP                 1                           ;恢复现场

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本文关键字：单片机  通信  程序  51单片机，单片机-工控设备 - 51单片机