- PIOs connect to practically anything
- Add PIO ports to the microcontroller
- Connect to various microcontroller peripherals (“sideband” signals)
- Connect to Configurable System Logic (CSL) functions or to other PIOs
- Significantly more I/O than original 8032
- Up to 316 PIOs on largest device, largest package
- No shared PIO pins with 8032 peripherals
- Re-use Memory Interface Unit (MIU) pins when accessing external peripherals
- Supports inputs, output, bidirectional signals
- Selectable drive strength (4 mA, 12 mA)
- Optional input hysteresis
- Optional BusMinder
- 50-100 K-ohm pull-up resistor
- 50-100 K-ohm pull-down resistor
- Bus follower (holds last valid level for a three-state bus)
- Optional low-power operation during processor's power-down mode
- Optionally three-state the output driver and turn on the bus follower
- Optionally force the input High
- 5-volt tolerant, 3.3-volt I/O
- Connects directly to other 3.3-volt and 5-volt devices
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