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An AVR parallel to SPI interface with parallel hand-shake interface to NEC v25 CPU FlashLite SBC
par2spi.c ATmega328p AVR used as parallel<-->serial SPI to interface the FlashLite v25 CPU board with Ethernet, LCD and/or SD Card (built into LCD). The Flashlite-V25 is a single board computer based on the NEC V-25 Plus micro-controller. The V-25 is a 16-bit, single-chip micro-controller that is software compatible with the Intel 8086/8088 family of microprocessors. It comes with embedded DOS and utility software on the on-board flash disk. This is a very simple implementation with no interrupt handling, per byte read and write operation only. AVR is used as a smart hand-shake capable shift register, with the interrupt handling done by the v25 CPU. The v25 uses a 82C55 PIO with PortA in Mode-2, with automatic hand shake signal generation and interrupt line to v25.
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