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Assume that there are two 7-segment LED displays connected to port B of a PPI (8255) at address 0770H. The displays are connected to the PPI through 7 Segment Display drivers as shown below. a) Write a macro, DIGITDISPLAY, that receives the packed BCD number as its input argument and displays the two-digit number on the given 7 segment displays. b) Write an assembly language program that uses the macro given in (a) to display the numbers, from 00 to 99 and then from 99 to 00 continuously in an infinite loop. The two-digit counter is incremented/decremented at every 0.5 seconds.

Assume that there are two 7-segment LED displays connected to port B of a PPI (8255) at address 0770H. The displays are connected to the PPI through 7 Segment Display drivers as shown below. a) Write a macro, DIGITDISPLAY, that receives the packed BCD number as its input argument and displays the two-digit number on the given 7 segment displays. b) Write an assembly language program that uses the macro given in (a) to display the numbers, from 00 to 99 and then from 99 to 00 continuously in an infinite loop. The two-digit counter is incremented/decremented at every 0.5 seconds.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Assume that there are two 7-segment LED displays connected to port B of a PPI (8255)
at address 0770H. The displays are connected to the PPI through 7 Segment Display drivers as
shown below.
a) Write a macro, DIGITDISPLAY, that receives the packed BCD number as its input argument
and displays the two-digit number on the given 7 segment displays.
b) Write an assembly language program that uses the macro given in (a) to display the
numbers, from 00 to 99 and then from 99 to 00 continuously in an infinite loop. The two-digit
counter is incremented/decremented at every 0.5 seconds.

PAO PA1 PA2 PA3 PA4 PAS PA6 PA7 PBO PB1 PB2 PB3 PB4 PB5 PB6 PB7 8255 PPI PCO PC1 PC2 PC3 PC4 Lseg Dise Dec 7.Seg a Dec PC5 PC6 PC7 88
Transcribed Image Text:PAO PA1 PA2 PA3 PA4 PAS PA6 PA7 PBO PB1 PB2 PB3 PB4 PB5 PB6 PB7 8255 PPI PCO PC1 PC2 PC3 PC4 Lseg Dise Dec 7.Seg a Dec PC5 PC6 PC7 88
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