SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
The Microcontroller Unit Subsystem is a “chip-in-a-chip” concept and operates using a separate voltage supply, clock sources and resets and includes the components needed for device management. This allows the MCU to function continuously regardless of the state of the rest of the device, including periods in which the rest of the device is held in reset or powered down. Most communication between the MCU island and the rest of the SoC can (and, in a safety case, should) be conducted via internal SPI connections. These connections allow for safe communications to isolate the MCU island from faults in the rest of the SoC. The MCU island integrates communication peripherals such as MCSPI and MCAN which are expected to be used for safety critical communication, so if the main SoC goes down, the MCU island can communicate this information to the rest of the system. Isolation of the MCU Dual-Core Arm Cortex-R5F Microprocessor Subsystem helps to provide Freedom from Interference (FFI).
The MCU subsystem has integrated:
Figure 1-3 shows the block diagram of the device MCU domain.
The supported set of features and peripherals is device part number dependent. For more information, see the device-specific Datasheet.