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AVR Input/Output expansion
==========================
Modules
-------
| Module | Header | Enable Config | Description |
|-------------------------------|----------|-------------------------------------------|--------------------------------------------------------|
| [IO Ports](modules/ioport.md) | ioport.h | CONFIG_IOPORTS and CONFIG_IOE_PCINTERRUPT | Simple input/output port access |
| [SPI](modules/spi.md) | spi.h | CONFIG_SPI | Serial peripheral interface |
| [USART](modules/usart.md) | usart.h | CONFIG_USART | Universal synchronous/asynchronous receive/transmitter |
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