Question

Draw the command word format of 8255 in l/o mode?

Answer 1

Answer:

8255 microprocessor operating modes

There are 2 modes in 8255 microprocessor:

1. Bit set reset (BSR) mode – This mode is used to set or reset the bits of port C only, and selected when the most significant bit (D7) in the control ,register is 0. Control Register is as follows:

the followers part given in this picture