3 ms·

If that counts then you can do exactly the same thing with a UART-based protocol, no?

• monocasa 5y ago
  Do you know of any uart hardware that'll only latch on /SS active?
  • jstanley 5y ago
    No, I don't, but at the point where you're integrating a UART, adding a couple of logic gates on the data input doesn't seem too much of a stretch. I'm not saying using UARTs instead of SPI is a good idea! I'm just saying the reason that it's not a good idea is not because UART's don't have /SS inputs.
    • monocasa 5y ago
      But then how is the device supposed to know when it can respond? Most uart devices don't respect flow control. They assume they can transmit at any point.
      • jstanley 5y ago
        Fair point.