The Kindle's main processor is a Marvell PXA255 application processor,
XScale microprocessors are fifth-generation ARM processors based on ARMv5TE architecture. According to Intel's PXA255 datasheet on Alldatasheet.com, the PSA255 supports a flexible CPU clock speed from 100 to 400 MHz. I assume the "C400" marking on the Kindle's chip indicates this is a 400 MHz version.
In some Kindles, these chips have an Intel logo. Intel sold the PXA processor assets to Marvell in 2006.
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