51单片机汇编实现限幅滤波与中值滤波程序

 ;2220559348（如有问题可联系）
 ;2019.12.25
CH452_DCLK BIT   P2.5   ;串行数据时钟,上升沿激活  
CH452_DIN  BIT   P2.6  ;串行数据输出,接CH452的数据输入 
CH452_LOAD BIT   P3.3  ;串行命令加载,上升沿激活 
CH452_DOUT BIT   P2.7   ;接 CH452 的数据输出
AUXR equ 8EH

  ORG 0000H
  LJMP main
  ORG 0023H
  LJMP LOOP
  ORG 0100H
main: MOV P0,#11H
      MOV P2,#88H
      MOV R0,#30H
      MOV R1,#50H
      MOV 46H,#00H
      MOV 47H,#00H
       MOV 48H,#00H
MOV 49H,#00H
      MOV 40H,#00H;;;J
      MOV 41H,#00H
      CLR EA         ;清空EA
      MOV SCON,#50H ;8位数据,可变波特率,晶振频率11.0592MHz，波特率9600
      ANL AUXR,#0BFH ;定时器1时钟为Fosc/12,即12T
      ANL AUXR,#0FEH     ;串口1选择定时器1为波特率发生器
      MOV TMOD,#20H ;设定定时器1为8位自动重装方式
      MOV TL1,#0FDH ;设定定时初值
      MOV TH1,#0FDH ;设定定时初值

      CLR  ET1 ;禁止定时器1中断
      SETB TR1     ;启动定时器1
      SETB EA     ;开启总中断允许
      SETB ES ;开启串口中断

      CLR  CH452_DIN  ;先低后高,输出上升沿通知 CH452 选择 4 线串行接口       
      SETB  CH452_DCLK;置为默认的高电平       
          SETB  CH452_DIN    
          SETB  CH452_LOAD       
          SETB  CH452_DOUT;置为输入                  
          MOV B,#04H      ;B是高四位     
          MOV A,#03H      ;设置为键盘与显示开 ；A 是低八位                                                                                            
          ACALL CH452_WRITE    
          MOV B,#05H           ;设定显示参数
          MOV A,#0AH                ;设置no bcd 扫描极限最高1000B
          ACALL CH452_WRITE 
  ACALL banji


RECE:     ACALL  banji
          ACALL jiance
          AJMP RECE

jiance:
                MOV C,CH452_DOUT  ;判断是否有按键按下，位判断      
                JC TES        ;没有按键按下，继续检测
                ACALL CH452_READ  ;有按键按下，通过452读值    
                MOV R2,A 
                CJNE R2,#44H,TES   ;由键码得
                ACALL FILTER3