ALP PROGRAM TO INTERFACE RELAY INTERFACE

Aim:

To write an assembly language program to interface relay interface by using $8085$ microprocessor kit.

Apparatus required:

$1\mathrm{.}8085$ processor kit

$2.(0-5$V$)$ DC battery

$3.$ Relay interface card

Code and run the program segment

CMDB$8255$ EQU $23H$

PAB$8255$ EQU $20H$

PBB$8255$ EQU $21H$

PCB$8255$ EQU $22H$

ORG $,8600H$

MVI A$,80H$

OUT CMDB$8255,$ A

INFLOOP:

MVI A$,0FH$

OUT PAB$8255,$ A

CALL DELAY

MVI A$,00H$

OUT PAB$8255,$ A

CALL DELAY

JMP INFLOOP

DELAY

LXI $,H,03$FFFH

DELLOP:

DCX $,H$

MOV A$,H$

ORA L

JNZ DELLOP

RET

CMDB$82550023$ DELAY $8015$ DELLOP $8018$

INFLOOP $8004$PAB$8255,0020PBB82550021$

PCB$82550022$

Provide; algorithm, flowcharts, machine code, enter and run the program.

Each group students to write a Table of results and submit after the exercise