16 channel water lamp experiment based on Proteus (assembly language)

be based on Proteus Of 16 Road water lamp experiment ( assembly language )

Experimental content

use proteus Simulation 16 Road running water lamp . Programming , send 8255 Of A Mouth and B All ports are output , Data lamp D8～D1 From left to right , Only one light at a time , Cycle show ,D₁₆～D₉ And D₈～D₁ On the contrary , From right to left , Only one light at a time , Cycle show .

Circuit connection diagram

Minimum system

General diagram of circuit connection

Program code

DATA SEGMENT	

	IOCON   EQU 0B006H   ;0000 1011 0000 0000 0110   ;8255 Control port address 
	IOA     EQU 0B000H	 ;0000 1011 0000 0000 0000    ;8255 A Address 
	IOB     EQU 0B002H	 ;0000 1011 0000 0000 0010    ;8255 B Address 
	IOC     EQU 0B004H	 ;0000 1011 0000 0000 0100     ;8255 C Address 
	
DATA ENDS
STACKS SEGMENT
	 DW 100h DUP(?)
STACKS ENDS

CODE SEGMENT
ASSUME CS:CODE,SS:STACKS,DS:DATA

START:	 
	
	MOV DX,IOCON       ; Input control word 
	MOV AL,80H         ;1000 0000 
			   ; Sign bit is 1(D7=1),A Port mode selection mode 0(D6=0, D5=0)
			   ;A output (D4=0)
			   ;C Both input and output ports , Default output , namely D3=0 and D0=0
			   ;B Port mode selection mode 0(D2=0), meanwhile B The mouth also outputs (D1=0)
	OUT DX,AL

	; Here we use BL and BH The purpose of is to save the port value 
	; Because I / O instructions (IN,OUT) The destination operand of can only be AL or AX
	MOV BL,  01111111B    ; initialization , This is because the low level is on , So the initial setting D8 bright 
		     ; Pay attention here 0111 1111 From left to right is the change from high to low , namely 0 It's high 
	MOV BH, 11111110B    ; It's the same here , It's also initialization 
                      	 ;0 Bit lowest , Corresponding to D9 bright 

ENDLESS:

	MOV AL,BL      ; take BL Value is assigned to AL, Easy to output 
	MOV DX,IOA     ;A Port for output , Will be BL To output the value of 
	               ; For example, in the beginning BL The value is 0111 1111
	       ; that A After output ,PA7~PA0 The values of are 01111111, Which makes D8 Light on 		       
	OUT DX,AL      
	
	MOV AL,BH     ; take BH Value is assigned to AL, Easy to output 
	MOV DX,IOB   ;B Port for output , Will be BH To output the value of 
	OUT DX,AL    ; For example, in the beginning BH The value is 1111 1110, that B After output 
	             ;PB7~PB0 The values of are 11111110, Which makes D9 Light on 
	CALL DELAY0   ; Call delay subroutine 
	              ; The purpose is to allow a short stay time when two adjacent lights are on 
	
	MOV CL,1
	ROR BL,CL   ; take BL Cycle right one bit , Only one light is lit at a time 
	ROL BH,CL   ; take BH Cycle one bit left , Only one light is lit at a time 
	; Here a loop shifts left , A cycle to the right is to achieve the opposite goal 
	
	JMP ENDLESS   ; The cycle display light is on 

DELAY0 PROC
        PUSH CX
	MOV CX,0
	LOOP $
	LOOP $
	LOOP $
	MOV CX,15000
	LOOP $
	POP  CX
	RET
	DELAY0 ENDP

			    
CODE ENDS 
END START

Additional explanation

The definition of the port address in the program depends on the smallest system in the circuit connection diagram .
For example, in this minimal system built in this article ,8255A The control port address is 1011 0000 0000 0110 ,A The port address is 1011 0000 0000 0000 ,B The port address is 1011 0000 0000 0010 ,C The port address is 1011 0000 0000 0100 .
because 8255A$\overline{\text{CS}}$ The next thing is IO3, Corresponding 74HC138 in A₁₂,A₁₃,A₁₄ The corresponding value is 011, because 74HC138 The next thing is A₁₅, therefore A₁₅ The value of is 1, therefore 8255 The high value of each port 4 All places are 1011, And because of 8255A Chip A₀ End sum A₁ The termination is A₁ and A₂（ Note that there 8255A Of A₀ The termination is A₁,A₁ The termination is A₂）, So when selecting control port operation A₁ and A₂ by 11, When choosing A Port operation A₁ and A₂ by 00, When choosing B Port operation A₁ and A₂ by 01, When choosing C Port operation A₁ and A₂ by 10. In this way, the corresponding port values of different ports are obtained .
stay dosbox Corresponding to the smallest system in 8255A The control port address is 63H,A The port address is 60H,B The port address is 61H,C The port address is 62H. In the experimental box, there may be another address . To make a long story short , The chip port values corresponding to different systems are different , This needs attention .

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Resource link ：proteus Simulation 16 Road water lamp experiment ( assembly language )