A hardware block diagram is one way to approach this task, often starting with the communication interface. UART, USB, I2C, and SPI are among those likely to be used by a microcontroller. USB and ...

Using the general hardware block diagram, make a list of all the external interfaces that the microcontroller will need to support. There are two general types of interfaces that need to be listed.

Figure 4. A module-to-shelf communication and a shelf-to-PC communication block diagram. The main microcontroller processes and transmits data from various peripherals to the shelf microcontroller ...