According to the datasheet of the HMC1197 IQ-modulator an SPI master places 24-bit data on the SDI for transmitting.
My question is the following:
Most 32-bit microcontrollers allow up to 16-bit data frame to send in one transmission cycle.
Is it possible to send first 16-bit data to the HMC1197, then toggle the "SEN" line, then send 8-bits data frame?
If you stick to the minimum timing values as stated in the datsheet, I think it would not be problem.
Any help I will appreciate.