Rabbit RIO™ Programmable I/O Chip
The RIO (Rabbit I/O) is a versatile programmable I/O chip, featuring I/O expansion and specialty features compatible with any processor that has an available clocked serial port. Since the RIO is part of the Rabbit Semiconductor® family of devices, Dynamic C® library and sample programs are available to quickly integrate the RIO into Rabbit® systems. Additionally, ANSI C and assembly level sample programs are available to assist integrating the RIO into any programming environment.
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Link To Rabbit RIO Website