SPI	APPLICATION FILE PAGE
SPI.DSN SPIM.ASM SPIST.ASM SPISR.ASM	Proteus VSM design file created as ISIS interactive schematic Source code file – MASTER PROGRAM (U1) Source code file – SLAVE TRANSMITTER (U2) Source code program – SLAVE RECEIVER (U3)
OPERATION This system demonstrates SPI serial communication. Each chip has its own program. Plain BCD numerical data is generated by the slave transmitter from a thumbwheel switch, and read by the master using the slave select input. The master then re-sends the same data to the slave receiver, which responds to an SPI interrupt when data input is detected.