实验四：8255 控制交通灯实验.doc

实验四 8255控制交通灯实验 1、编写程序：使用8255的PA0..2、PA4..6控制LED指示灯，实现交通灯功能。 2、连接线路验证8255的功能，熟悉它的使用方法。 .MODEL TINY COM_ADD EQU 0F003H PA_ADD EQU 0F000H PB_ADD EQU 0F001H PC_ADD EQU 0F002H .STACK 100 .DATA LED_Data DB ;???÷?ìμ?￡???±±oìμ? DB ;???÷?ìμ?éá??￡???±±oìμ? DB ;???÷??μ?áá￡???±±oìμ? DB ;???÷oìμ?￡???±±?ìμ? DB ;???÷oìμ?￡???±±?ìμ?éá?? DB ;???÷oìμ?￡???±±??μ?áá .CODE START: MOV AX,@DATA MOV DS,AX NOP MOV DX,COM_ADD MOV AL,80H OUT DX,AL MOV DX,PA_Add MOV AL,0FFH OUT DX,AL LEA BX,LED_Data START1: MOV AL,0 XLAT OUT DX,AL Call DL5S MOV CX,6 START2: MOV AL,1 XLAT OUT DX,AL CALL DL500mS MOV AL,0 XLAT OUT DX,AL Call DL500ms Loop Start2 MOV AL,2 XLAT OUT DX,AL Call DL3S MOV DAL,3 XLAT OUT DX,AL Call DL5S MOV CX,6 START3: MOV AL,4 XLAT OUT DX,AL CALL DL500ms MOV AL,3 XLAT OUT DX,AL CALL DL500ms LOOP START3 MOV AL,5 ;???÷oìμ?￡???±±??μ?áá XLAT OUT DX,AL CALL DL3S JMP START1 DL500ms PROC NEAR PUSH CX MOV CX,60000 DL500ms1: LOOP DL500ms1 POP CX RET DL500ms ENDP DL3S PROC NEAR PUSH CX MOV CX,6 DL3S1: CALL DL500ms LOOP DL3S1 POP CX RET ENDP DL5S PROC NEAR PUSH CX MOV CX,10 DL5S1: CALL DL500ms LOOP DL5S1 POP CX RET ENDP END START