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Reference.org
Parallel slave port
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<p>A parallel slave port (PSP) is an interface found on some <a href="/facts/PIC_microcontroller/NrRJCqHS">PIC microcontrollers</a>. It allows 8-bit asynchronous bidirectional data transfer between the PIC and external devices, such as other microcontrollers or <a href="/facts/Personal_computers/koaYfNce">personal computers</a>. </p>