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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 |