Hello,

Is it possible to read status of an output port?
Say I send some data on the Port A (configured as output) of 8255. Now I want to make bit 3 of this port as 0. It can be accomplished by ANDing the port A with 0xf7 . But for ANDing purpose, I need to know the previous status of the port A. Can I read the status of the port A and then do the ANDing operation.

Regards,

Mohit