I am trying to establish communication with a device via SPI with the Arduino Due.
The device is a ATA6870: http://www.atmel.com/Images/doc9116.pdf
The datasheet makes me believe the system requires a system clock CLK of 450-550khz (maximum) and an SCK of half the system clock.
The Due has an 84MHz system clock and the SPI library allows us to divide the clock by 255 maximum. This would give the slowest SPI SCK of approximately 330kHz so in order to meet the half system clock criteria the system clock would need to be 660Hz which is more than its allowed maximum.
I am not confident enough in my knowledge to understand how I can overcome this problem or even if it is in fact a problem!. Any pointers in the right direction would be much appreciated.