Download Arduino Nano Spi Pinout Gallery. Following figure shows the pinout of arduino nano board. We've created a well explained, diagram based arduino nano has similar functionalities as arduino duemilanove but with a different package.
Act as a synchronizing clock.
The arduino nano is a microcontroller board, based on the atmega328p microcontroller by atmel. Apart from serial communication the nano board also support i2c and spi communication. Since, for the nano, pin 13 is also sclk for spi, you may well run into trouble with high baud rates. Act as a synchronizing clock.