d792.txt

本次课程设计的任务是：针对大学的计算机系本科课程

;实验三   8279键盘显示实验
Z8279    EQU       212H
D8279    EQU       210H
LEDMOD   EQU       00h   ;左边输入,八位显示外部译码八位显示
LEDFEQ   EQU       38H ;扫描频率
CODE     SEGMENT
ASSUME    CS:CODE,DS:CODE
START:                         ;初始化
  	 PUSH   CS
	 OUT       DX,AL
	 POP    DS
	 MOV       DX,Z8279
	 MOV       AL,LEDMOD
	 MOV       AL,LEDFEQ
	 OUT       DX,AL
	 MOV       DX,D8279
	 MOV       AL,7FH
	 OUT       DX,AL
	 MOV       DX,D8279  
	 MOV       AL,7FH
	 OUT       DX,AL
	 MOV       DX,D8279  
	 MOV       AL,7DH
	 OUT       DX,AL
	 MOV       DX,D8279  
	 MOV       AL,7FH
	 OUT       DX,AL
	 MOV       DX,D8279  
	 MOV       AL,70H
	 OUT       DX,AL
	 MOV       DX,D8279   
	 MOV       AL,5bH
	 OUT       DX,AL
	 MOV       DX,D8279  
	 MOV       AL,70H
	 OUT       DX,AL        
	 MOV       DX,D8279
	 MOV       AL,76H
	 OUT       DX,AL          ;以上为写(HKZK88)
	 NOP
	 MOV       DX,Z8279
	 MOV       AL,0C2H
	 OUT       DX,AL          ;置空FIFO寄存器
	 MOV       CL,00H        ;改
 WAIIT:                
     NOP
	 IN     AL,DX
	 MOV    BL,AL
	 AND    AL,80H
	 CMP    AL,80H
	 JE     WAIIT             ;FIFO正在清除期间则跳转等待
	 MOV    AL,BL
	 AND    AL,0FH
	 CMP    AL,00H
	 JE     WAIIT             ;无键按下则等待
	 CMP    CL,02H            
     JE     OUTPUT
NEXT: MOV    AL,40H            ;写 读FIFO RAM命令字
	 OUT    DX,AL
	 MOV    DX,D8279          ;读入FIFO RAM内容
	 IN     AL,DX
	 NOP              
     CMP    AL,3bH
     JE     FINI
                              ;查表,将键码放入AL中
	 LEA    BX,LED
	 XLAT
	 MOV    DX,D8279          ;将AL中内容写到数码管上
	 OUT    DX,AL
	 MOV    DX,Z8279          ;清FIFO RAM寄存器
	 MOV    AL,0C2H
	 OUT    DX,AL
	 inc    cl
	 and    cl,07h
	 JMP    WAIIT             ;等待下一次键输入
FINI:MOV    DX,Z8279
     MOV    AL,0D3H
     OUT    DX,AL
     JMP    $  
	 
	 
 LED   DB   07H,66H,06H,3FH
       DB   00H,00H,00H,00H 
       DB   7FH,6DH,5BH,71H
       DB   00H,00H,00H,00H
       
       DB   00H,00H,00H,00H
       DB   00H,00H,00H,00H
       DB   00H,00H,00H,00H
       DB   00H,00H,00H,00H
       
       DB   6FH,7DH,4FH,79H
       DB   00H,00H,00H,00H
       DB   77H,7CH,39H,5EH  
       DB   00H,00H,00H,00H
       
       DB   00H,00H,00H,00H
       DB   00H,00H,00H,00H
       DB   00H,00H,00H,00H
       DB   00H,00H,00H,00H 
output:                         ;改
       push dx
       push ax
       mov  dx,d8279
       mov  al,7fh       ;8
       out  dx,al
       mov  dx,d8279
       mov  al,7fh       ;8
       oUt  dx,al
       inc  cl
       inc  cl
       pop  ax
       pop dx
       
       jmp next
      CODE  ENDS
END      START