# Parallel Peripheral Interface

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The **Parallel Peripheral Interface** (**PPI**) is a peripheral found on the [Blackfin](/source/Blackfin) embedded processor. The PPI is a [half-duplex](/source/Half-duplex), [bi-directional](/source/Two-way_communication) port that is designed to connect directly to [LCDs](/source/LCD), [CMOS sensors](/source/CMOS_sensor), [CCDs](/source/Charge-coupled_device), video encoders (video [DACs](/source/Digital-to-analog_converter)), video decoders (video [ADCs](/source/Analog-to-digital_converter)) or any generic high speed, parallel device.[1]

The width of the PPI is programmable and can be set between 8 and 16 bits in 1-bit increments. The latest Blackfin family (BF54x) also features an 18/24-bit PPI for direct connection to [RGB](/source/RGB) LCD panels.

The PPI can run from 0 [MHz](/source/MHz) up to 66 MHz.

The PPI has a dedicated clock pin, three multiplexed frame sync pins, and between 16 and 24 data pins.[2]

## References

1. ["PPI: Parallel Peripheral Interface \[Analog Devices Wiki\]"](https://wiki.analog.com/resources/eval/sdp/sdp-b/peripherals/ppi). *wiki.analog.com*. Retrieved 2021-10-01.

1. Y, Roshni (2019-07-04). ["What is 8255 Programmable Peripheral Interface (PPI)? Definition, Architecture, Pin Diagram and Modes of Operation of 8255"](https://electronicsdesk.com/8255-ppi.html). *Electronics Desk*. Retrieved 2021-10-01.

[http://blackfin.uclinux.org/doku.php?id=ppi](http://blackfin.uclinux.org/doku.php?id=ppi)

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Adapted from the Wikipedia article [Parallel Peripheral Interface](https://en.wikipedia.org/wiki/Parallel_Peripheral_Interface) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Parallel_Peripheral_Interface?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.