Overclocking

This experiment shows the overclocking results of the Atmel SAMG55 ARM Cortex M4F MCU.

The settings used:

- 3.3V supply voltage

- CPU clock from the external 32.768 KHz crystal multiplied by the internal PLL

- USB HID stack was running parallel

- 16K cache

- 5 flash wait states

- application runs from on-chip flash

- test application is the encoding + decoding of a 320 sample frame with CODEC2 700C algorithm (http://www.rowetel.com/?page_id=452)

The dataset:

freq.	120 MHz	130 MHz	140 MHz	150 MHz	160 MHz
encode + decode time	28,5 ms	26,5 ms	25 ms	23 ms	21,5 ms

120 MHz is the maximal CPU clock frequency allowed officially. The MCU was running stable at 160 MHz with continuous USB HID data communication.

The experiment shows, that 33% overclocking is still stable.

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