While working on a circuit, I am confused on connecting daisy chained 74HCT595 and 74HCT165 to microcontroller.
I am developing the circuit so that microcontroller can be connected as separate add-on module. I am planning to use:
The confusion is that the Shift-Registers refer to SPI communication on some internet sources while others say it is not an SPI device. I did refer to the datasheets which makes no reference to SPI, but I have been able to make these work over SPI.
Do I need to connect the Shift Registers to SPI (MISO/MOSI/CLK) pins, or can it be connected to any general purpose GPIO on both the above micro controller?