• BSR Mode (BSR Command) is only applicable for Port C. In this Mode the individual bits of Port C can be set or reset. This is very useful as it provides 8 individually controllable lines which can be used while interfacing with devices like an A to D Converter or a 7-segment display etc.
• The individual bit is selected and Set/reset through the control word. Since the D7 bit of the Control Word is 0, the BSR operation will not affect the I/O operations of 8255.

Control Word of 8255 in BSR