I used SPI to read a 12-bits device. Thus, the SPI read 2 bytes to finish the read.
However, something strange is, if I set the SPI clock rate faster than 0.333525us, then the "chip select" will still toggle even I set it as no.
It cause a wrong reading if CS was toggled between characters transmission.
Below waveform shown the result when set the clock rate to 0.333525us.
The SPI read 2 bytes data continually without CS toggling.
Below waveform shown the result when set the clock rate to 0.083381us.
The CS will be toggling between characters transmission.
Hope someone can help one this.