Arduino Leonardo and SPI Communications

Arduino Leonardo and SPI Communications using the ENC28J60 ethernet module
I just found out that my favorite Arduino of choice (the Leonardo) has a problem with SPI  “Serial Peripheral Interface” communications (if you need to use the SS pin).  For SPI (which is bidirectional) , the following pins are normally used: SS – Slave Select - digital 10. You can use other digital pins, but

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Arduino Leonardo without Headers –

The Arduino Leonardo is a microcontroller board based on the ATmega32u4 data sheet. It has 20 digital input/output pins 7 of which can be used as PWM outputs and 12 as analogueue inputs a 16 MHz crystal oscillator a micro USB connection a power supply socket an ICSP header and a reset button. It contains everything was necessary to support the microcontroller; simply connect it to a computer with a USB cable or operate it with an AC/DC adapter or a battery to get started.

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