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• Bit 0 – SPI2X: Double SPI Speed Bit
When this bit is written logic one the SPI speed (SCK Frequency) will be doubled when the SPI is in Master mode (see Table 68). This means that the minimum SCK period will be two CPU clock periods.When the SPI is configured as Slave, the SPI is only guaranteed to work at fosc/4 or lower.
и в табличке из электрических характеристик:
.............................min
10....SCK period....Slave...4• tck
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