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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27.7 | BIT SET/RESET MODE
27.6 | Mode 2 of 8255 (Bidirectional Bus Mode)
One major limitation of mode 1 of 8255 is its inability to cater the demand of asynchronous bidirectional data
transfer. It is possible only by changing the concerned port’s confi guration from input to output or vice versa
through a fresh command word to the control register for every change of direction of data communication.
is may not be a happy solution for the system designer and to eliminate this problem, 8255 off ers mode 2,
which is capable of bidirectional asynchronous data transfer with any external device. However, as we have
already indicated, mode 2 is ...
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