Traffic Light Interface Using 8085

TRAFFIC LIGHT

AIM:

USING 8255 SIMULATE THE  TRAFFIC LIGHT FOR THE FOLLOWING STATES USING 8085.

State: 1-Vehicles from south should move to north, west and east directions

State: 2-Vehicles from east should move to west, north and south directions

State: 3-Vehicles from west should move to north, south and east directions

State: 4-Vehicles from north should move to south, west and east directions

Generate states opcode and simulate.

ADDRESS	OPCODE	LABEL	MNEMONICS	OPERAND	COMMENT
8800			MVI A	80
8801
8802			OUT	43H
8803
8804		AGAIN	MVI C	04H
8805
8806			LXI H	8850
8807
8808
8809		NEXT	MOV	A,M
880A			OUT	40H
880B
880C			INX	H
880D			MOV	A,M
880E			OUT	41H
880F
8810			INX	H
8811			MOV	A,M
8812			OUT	42H
8813

ADDRESS	OPCODE	LABEL	MNEMONICS	OPERAND	COMMENT
8814			INX	H
8815			CALL	DELAY
8816
8817
8818			DCR	C
8819			JNZ	NEXT
881A
881B
881C			JMP	AGAIN
881D
881E
881F		DELAY	MVI	B,0FH
8820
8821		D1	LXI	D,FFFF
8822
8823
8824		D2	NOP
8825			NOP
8826			DCX	D
8827			MOV	A,D
8828			ORA	E
8829			JNZ	D2
882A
882B
882C			DCR	B
882D			JNZ	D1
882E
882F
8830			RET

DATA

ADDRESS	OPCODE	LABEL	MNEMONICS	OPERAND	COMMENT
8850				88	STATE 1
8851				83	''
8852				F2	''
8853				83	STATE 2
8854				88	‘’
8855				F8	‘’
8856				88	STATE 3
8857				38	‘’
8858				F1	‘’
8859				38	STATE 4
885A				88	‘’
885B				F4	‘’

OBSERVATION: