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Problem with SPI CLCK

Hey folks, I'm trying to modify the SPI Master loop back example into a 4 line SPI Master_Slave program. Whenever I change the Tx_Buffer_lenght from 10 to lsome other numbers I see the the clock rate (frequency) on the oscilloscope changes. I assumed that the clock rate should always stay at 1MHz despite the change in other parameters. Why is this happening? Thank You

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