Industrial standard communication between multiple micro controllers on same pcb

Question

I'm just wondering what would be considered industry practice of communicating between multiple micro controllers on the same pcb for instance when the digital i/o's or analog ins have been used.

Answer 1

There are numerous standardized link layer interfaces available - typically at least I2C, SPI, UART and parallel - but to the best of my knowledge there are no uniformly accepted standards for higher level protocol layers for inter-MCU comms. If you need to do it then you just roll your own to suit your particular requirements.