[General] General Purpose Input Output(GPIO)

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K Srinivas Pavan Kumar

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Hi,
How can we say that input pins are readable and output pins are both readable and writable in
Genearl Purpose Input/output(GPIO)
 

Doesn't matter what micro controller we are speaking about. It is true. Output stage is always latched and can be readed. In case of short circuit output 1 will be readed as 0. Enabling pin to output means just hold one of two push-pull transistor opened. Also, pull-up and pull-down combination can be specified as a semi-output or e.t.c.
 

Every micro controller having internal pull-up resistors.
Depending on the direction register value the particular pin will acts as input or output.
 

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