Interfacing
of 8051 with 8255 for expanding of I/O
·
The interfacing the external memory to 8051, port 0, port 2 are used as
multiplexed address/data bus and higher order address bus.
·
If the circuit requires interrupt or I/O then port 1 is only available for
this purpose.
·
Hence, in such situations it becomes essential to increase the I/O
handling capacity.
·
The I/O expansion is possible twit the help of 8255 PPI.
·
The figure shows the expanded I/O ports using 8255.
The data bus is
connected to port 1.
Que: Draw
and explain with schematic diagram hardware interfacing of 8255 with
8051 microcontroller.
No comments:
Post a Comment