UART hardware is found on nearly every processor. Because of its wide availability and simple implementation, UART is found in systems across every market sector. It is a common means of processor to processor communications as well as communication between microcontrollers and peripherals. In the automotive advanced driver-assistance system (ADAS) applications, like the surround view system electronic control unit (ECU) or ADAS domain controller, UART is used in the digital processing block to enable communication between the application processor and the automotive microcontroller (MCU) as shown in Figure 2-8.
RS-232 communication port in Remote Radio Units (RRU) is used to control the fan and climate control in the system, while also providing a debug consol interface. To ensure the RS-232 transceiver receives proper logic levels, a voltage translator, such as an AXC family device, may be used between the processor and transceiver as shown in Figure 2-9.