interfacing 7 segment display with 8086 processor

Statement: Program to interface 8086 microprocessor kit with Seven Segment Display and make any digit to Blink

Description:

In this program we interface 8086 microprocessor with Seven Segment Display and diaplay a digit.  To interface with Seven Segment Display,we must be familiar with 8255A PPI, which has three ports which can be used as I/O ports. The ports A, B and C are identified using addresses 19H, 1BH, and 1DH respectively and control register address is 1FH. We use Seven Segment Display structure using the following digit

	Digit	Hexadecimal	Decimal	Binary
8	0 1 2 3 4 5 6 7 8 9	C0 F9 A4 B0 99 92 82 F8 80 90	192 249 164 176 153 146 130 248 128 144	11000000 11111001 10100100 10110000 10011001 10010010 10000010 11111000 10000000 10010000

code: 

Source program:

 MOV AL,10000000B

 OUT PPI_C, AL

STR:   MOV AL, 10011001B

 OUT PPIA,AL

 MOV CX, FFFFH

DEL:    NOP

 NOP

 NOP

 LOOP DEL

 MOV AL, 11111111B

 OUT PPIA, AL

 MOV CX, FFFFH

DEL1:    NOP

 NOP

 NOP

 LOOP DEL1

 JMP  STR

 HLT