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R5F21355CNFP#X6 Application Field and Working Principle

The R5F21355CNFP#X6 (also referred to as the R5F21355C) is an ultra-low-power low-end 8-bit microcontroller that is ideal for embedded applications in consumer, automotive, industrial, and other markets. It is based on the Renesas RXv3 core which provides 16-bit instructions, 120 megahertz performance, and a wide range of peripherals. The device also offers an on-chip power management unit, an enhanced security subsystem, memory protection, and advanced debugging capabilities.

Device Overview

The R5F21355CNFP#X6 microcontroller is a 16K ROM, 512 bytes RAM device equipped with a range of peripherals including a controller-area-network (CAN), peripheral-interface (PI/UART), SPI, I2C, and other features. It has on-chip 8-bit ADC and 8-bit DAC with 8-bit resolution. It is powered by an ultra-low-power 32MHz RXv3 core and uses a dual supply voltage. The device is available in a 24-pin BGA package.

Architecture

The R5F21355CNFP#X6 is based on the Renesas RXv3 core and is optimized for low-power operation. It measures only 5 mm², which makes it ideal for various embedded applications such as metering, lighting and industrial control, home appliances, automotive, and remote monitoring. The core uses 16-bit instructions and provides a 120MHz performance. The device also has an on-chip power management unit providing a dedicated power save mode to reduce power consumption.

Memory Map

The R5F21355CNFP#X6 has a 12-bit address bus, allowing for addressing up to l4 addresses. It provides a 16KB on-chip ROM containing the program code and a 512-byte RAM for user data storage. It also has an 8-bit nonvolatile SRAM for external storage. The device is also equipped with two interrupt lines to handle external interrupts.

Peripheral Interface

The R5F21355CNFP#X6 microcontroller provides a wide range of communication interface features. It features an 8-bit analog-to-digital converter (ADC), an 8-bit digital-to-analog converter (DAC) with 8-bit resolution, and a controller-area-network (CAN) with four channels. The CAN interface is one of the most powerful features of this device, allowing for efficient communication between multiple devices over long distances. Additionally, the device has a peripheral-interface (PI), UART, SPI, and I2C interfaces for communication to external devices. It also features a real-time clock (RTC), two independent watchdog timers, and two general-purpose I/O ports.

Security

The R5F21355CNFP#X6 microcontroller provides an enhanced security subsystem featuring a built-in cryptographic authenticator, SHA hash engine, true random number generator (TRNG), an advanced encryption engine (AES) and an integrated boot security processor (BSP) that provides an authenticate-before-use scheme. This allows secure booting and secure communication improvements, such as protected boot, secure boot-rom with 256-level encryption, and secure programming. The device also supports protected data access, secure boot-loader, root-of-trust (RoT), and secure file system support.

Debugging

The R5F21355CNFP#X6 microcontroller has a built-in debug unit that provides a whole range of debugging functions. It features an enhanced range of debugging features such as instruction trace, breakpoints, data breakpoints, and hardware breakpoints. The debug unit also supports instruction step, data read and write, as well as read-write of peripheral registers. It supports events such as interrupts and exceptions, instruction execution timing and other system events. Additionally, it supports code compression, allows for break and background debug, and instruction tracing and profiling. The device is also equipped with the Renesas e2 studio integrated development environment (IDE) for easier debug and programming.

Application

The R5F21355CNFP#X6 microcontroller is ideal for embedded applications in consumer, automotive, industrial, and other markets. Its low power consumption and enhanced security make it suitable for a range of applications such as consumer electronics, home appliances, metering, lighting and industrial control, automotive, and remote monitoring. The device is also ideal for security systems, authentication systems, and smart metering.

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