Quasi-bidirectional I/O

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A quasi-bidirectional I/O is a type of input-output port on an integrated circuit such as a PIA. It can be used as an input or output without the use of a control signal for data direction. At power-on the I/Os are HIGH. In this mode, only a current source to VDD is active. An additional strong pull-up to VDD allows fast rising edges into heavily loaded outputs.


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