unconnected SPI performance (transfer 1000 bytes) maple spi maple spi/dmaSPI clock read/write read/write1.125MHz .85mbs 1.125mbs2.25MHz 1.35mbs 2.25mbs4.5MHz 1.8mbs 4.5mbs9MHz 2.2mbs 8.9mbs18MHz 2.2mbs 17.8mbs SD/SPI block (512 bytes) read/write Arduino SD/RTC shield maple spi maple spi/dmaSPI clock read write read write1.125MHz 0.75mbs 0.64mbs 1mbs 0.84mbs2.25MHz 1.1mbs 0.91mbs 1.86mbs 1.36mbs4.5MHz 1.4mbs 1.2mbs 3.19mbs 2.0mbs9MHz 1.6mbs 1.25mbs 5.1mbs 2.6mbs18MHz 1.6mbs 1.3mbs 7.1mbs 3.06mbs arduino avr328/16MHz SPI SD (with OPTIMIZE_HARDWARE_SPI)SPI clock read/write read write2MHz 1.57mbs 1.4mbs 1.2mbs4MHz 2.6 mbs 2.3mbs 1.7mbs8MHz 3.8mbs 3.4mbs 2.1mbs
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