May 2024
Intermediate to advanced
534 pages
17h 58m
English
book
8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
by Subrata Ghoshal
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
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404
INTERFACING INTEL 8255 PPI WITH 8051
10. Address of the control word register of 8255 is
(a) 00 (b) 01
(c) 10 (d) None of these
Search for Answers
1. How many pins are there for the DIP of 8255?
2. Which part of port C of 8255 serves group A and
which part serves group B?
3. Which purpose is served by the most signifi cant
bit (bit 7) of the control word sent to 8255?
4. How many diff erent combinations of inputs/
outputs of various ports are possible in mode 0 of
8255?
5. In mode 1 input for 8255, what must be the condi-
tion to make INTR change from low to high?
6. What is the major limitation of mode 1 of 8255?
7. What is the special purpose of mode 2 of 8255?
8. How many bits of port C of 8255 may be simulta- ...
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