# System Overview

RSL15 is a highly integrated secure Arm Cortex-M33-based Bluetooth Low Energy 5.2 wireless MCU system-on-a-chip, with flash and RAM, built-in power management, and an extensive set of peripherals. The wide supply voltage input, flexible I/O, and clocking scheme offer maximum design flexibility.

In RSL15, the lowest levels of common hardware usage are supported by a hardware abstraction layer (HAL). This HAL can be employed to simplify the use of the hardware, and to render more readable code that uses low-level hardware operations.

This system overview includes cross-references to relevant sections in the HAL topic of the RSL15 Firmware Reference. These links indicate where to look for low-level firmware that can be used to abstract unnecessary hardware details away from your code.

For more information about this topic, see: