Intel Quark SE Series Platform Manual page 33

UART
 Fractional clock divider that ensures less than 2% frequency error for most
supported baud rates
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June 2017
Document Number: 334715-004EN
Fraction resolution is 4 bits
Exception: 2.07% error for 1.391 Mbaud, 2.12% for 1.882 Mbaud and
2Mbaud, 2.53% error for 1.684 Mbaud
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Intel® Quark™ SE Microcontroller C1000
Platform Design Guide
33