Question

Application # 3: An 8255 IC is used to interface input and output devices with the 8086 microprocessor. Port-A is connected to seven-segment display driver and Port-B is connected to digit driver for 8-digit display set. Write a program to display UOHB2019 on the screen. Common To segment on at Digits Two Types: Common Anode (CA) Common Cathode (CC) AAAAAAAA AAAAAAAA 1 0 XX XXXX X110X 000 = 8060H (Port-A) 1 0 X X X XXX X110X 010 = 8062H (Port-B) 1 0 XX XXXX X110X 100 = 8064H (Port-C) 1 0 XX XXXX X110X 110 = 8066H (Control Register) Control Word: 1000 X00X = 80 H/89H model small START: PA equ 8060H PB equ 8062H PC equ 8064H CR equ 8066H TABLE DB XX DB XX DB XX DB XX DB XX DB XX DB XX DB XX code MOV CL, 8 MOV SI, OFFSET TABLE MOV AL, OFEH L1: OUT PB, AL MOV AH, AL MOV AL, [SI] OUT PA, AL CALL DELAY; 1 ms Delay INC SI ROL AH, 1 MOV AL, 80H MOV AL, AH OUT CR, AL LOOP L1 JMP START DELAY: MOV CX, 270 DEC CX JNZ L RET END

          Application # 3: An 8255 IC is used to interface input and output devices with the 8086 microprocessor. Port-A
is connected to seven-segment display driver and Port-B is connected to digit driver for 8-digit display set.
Write a program to display UOHB2019 on the screen.
Common To segment
on at Digits
Two Types:
Common Anode (CA)
Common Cathode (CC)
AAAAAAAA AAAAAAAA
1 0 XX XXXX X110X 000 = 8060H (Port-A)
1 0 X X X XXX X110X 010 = 8062H (Port-B)
1 0 XX XXXX X110X 100 = 8064H (Port-C)
1 0 XX XXXX X110X 110 = 8066H (Control
Register)
Control Word: 1000 X00X = 80 H/89H
model small
START:
PA equ 8060H
PB equ 8062H
PC equ 8064H
CR equ 8066H
TABLE DB XX
DB XX
DB XX
DB XX
DB XX
DB XX
DB XX
DB XX
code
MOV CL, 8
MOV SI, OFFSET
TABLE
MOV AL, OFEH
L1: OUT PB, AL
MOV AH, AL
MOV AL, [SI]
OUT PA, AL
CALL DELAY; 1
ms Delay
INC SI
ROL AH, 1
MOV AL, 80H
MOV AL, AH
OUT CR, AL
LOOP L1
JMP START
DELAY: MOV CX, 270
DEC CX
JNZ L
RET
END

Application # 3: An 8255 IC is used to interface input and output devices with the 8086 microprocessor. Port-A
is connected to seven-segment display driver and Port-B is connected to digit driver for 8-digit display set.
Write a program to display UOHB2019 on the screen.
Common To segment
on at Digits
Two Types:
Common Anode (CA)
Common Cathode (CC)
AAAAAAAA AAAAAAAA
1 0 XX XXXX X110X 000 = 8060H (Port-A)
1 0 X X X XXX X110X 010 = 8062H (Port-B)
1 0 XX XXXX X110X 100 = 8064H (Port-C)
1 0 XX XXXX X110X 110 = 8066H (Control
Register)
Control Word: 1000 X00X = 80 H/89H
model small
START:
PA equ 8060H
PB equ 8062H
PC equ 8064H
CR equ 8066H
TABLE DB XX
DB XX
DB XX
DB XX
DB XX
DB XX
DB XX
DB XX
code
MOV CL, 8
MOV SI, OFFSET
TABLE
MOV AL, OFEH
L1: OUT PB, AL
MOV AH, AL
MOV AL, [SI]
OUT PA, AL
CALL DELAY; 1
ms Delay
INC SI
ROL AH, 1
MOV AL, 80H
MOV AL, AH
OUT CR, AL
LOOP L1
JMP START
DELAY: MOV CX, 270
DEC CX
JNZ L
RET
END

Added by Stephanie F.

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