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8051 port configuration

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dinesh401

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can anyone tel me. how a 8051 microcontroller pin will be worked. my doubt is that in the programing we hav to initialize the port as input or output. like

po=0x00;//initialize as output

but where as coming to 8051 programming, in the program we are writing the code on the same port po=0xi;, i is a variable changing its value always. even then also how the port is acting like a output port. when we send the i value as po=0x11; in the program. why it is not acting as a input port. can anyone tel me how a port will works. i didnt understand from the text.
 

for 8051s , you can write to the port registers (P0 , P1...) the data required and it will reflect on the output port pins.

when you read the port registers (PO, P1..) you are reading the actual port .

only precaution for 8051s are this:

whwnever you want to read the ports , fist write to the port a 1.
then read the port.

otherwise , the port pin may get damaged.

for writing(output) , no restrictions.
for reading(input) , write a 1 first and then read the port.
 

Summary to configure a port as input port (or pin) send FFhex to that port (or 1 = High to that pin) else it can be used as output port.
 

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