Spi 3 wire and 4 wire

[nimmyj]

three wire spi and four wire spi for Atmega 16 interfacing are same??

 

[HTA]

For bidirectional SPI communication (read/write) you need 4 wires. Here is a description of how to use it **broken link removed** .

Enjoy your design work!

 

[nimmyj]

Thank you..

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THANK YOU..

 

[alexan_e]

For bidirectional SPI communication (read/write) you need 4 wires.

No, there is also the three wire version where the MISO/MOSI lines are a single bidirectional data line

https://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus#Three-wire_serial_buses