Renesas R5F104MJAFB#50

Overview

R5F104MJAFB#50 from Renesas is an RL78/G14 8-bit microcontroller with 192 KB flash, 8 KB data flash, and 20 KB RAM, operating at up to 32 MHz (44 DMIPS), featuring ultra-low power consumption (66 μA/MHz active, 0.60 μA RTC+LVD mode), integrated 10-bit ADC (20 channels), dual UART/LIN, I²C, SPI, RTC, and 12-bit interval timer - deployed in battery-powered industrial sensors and smart metering endpoints.

For engineers reviewing the R5F104MJAFB#50 datasheet, R5F104MJAFB#50 pinout, R5F104MJAFB#50 application, or R5F104MJAFB#50 equivalent, key selection considerations include its 80-pin LFQFP-0.5 mm package, -40°C to +105°C industrial temperature grade (G), on-chip debug support, BGO-capable data flash rewrite, and hardware event linking via ELC for deterministic peripheral coordination.

Technical Context

The R5F104MJAFB#50 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.03125 µs (32 MHz) to 30.5 µs (32.768 kHz), multiply/divide/accumulate instructions, and 1 MB address space. It integrates a Data Transfer Controller (DTC) with chain transfer and block modes, activated by 19–26 configurable event sources routed through the Event Link Controller (ELC).

Its analog subsystem includes a 10-bit A/D converter with internal 1.45 V reference and temperature sensor, dual 8-bit D/A outputs (0–VDD), and two comparators with selectable internal/external reference. Power management features HALT, STOP, and SNOOZE low-power modes, on-chip POR and 14-level LVD, and high-accuracy ±1.0% on-chip oscillator (1–64 MHz).

Key Specifications

Pinout & Package

Package: 80-pin LFQFP, 12 mm × 12 mm, 0.5 mm pitch, lead-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with R5F104MJAFB#50, R5F104MLAFB#50 provides scalable memory headroom for feature-rich firmware, while R5F104MJGFB#50 offers identical electrical and thermal performance in tray packaging - enabling seamless transition between production and evaluation workflows.

Availability

R5F104MJAFB#50 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart utility meters, and building automation controllers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for R5F104MJAFB#50 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/G14 product line delivers true low-power 8-bit MCUs targeting cost-sensitive, battery-operated industrial and consumer devices requiring robust peripheral integration and certified functional safety support.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating for the R5F104MJAFB#50?

The R5F104MJAFB#50 operates at up to 32 MHz with a measured performance of 44 DMIPS. This rating is achieved using the RL78 CPU core's 3-stage pipeline and optimized instruction set, including hardware multiply/divide. The high-speed on-chip oscillator supports ±1.0% accuracy across 1.8–5.5 V and -20°C to +85°C, ensuring deterministic timing without external crystals in many applications.

Does the R5F104MJAFB#50 support background data flash rewriting while executing application code?

Yes, the R5F104MJAFB#50 supports Background Operation (BGO) for data flash. During BGO, the CPU can execute instructions from program memory while the data flash is being rewritten - critical for secure over-the-air updates and nonvolatile parameter storage without halting real-time tasks. The data flash endurance is rated at 1,000,000 write cycles (typical) at VDD = 1.8–5.5 V.

What are the supported serial communication interfaces on the R5F104MJAFB#50?

The R5F104MJAFB#50 integrates three UART/LIN channels (with automatic LIN break detection), up to ten I²C/simplified I²C channels (supporting standard/fast-mode), and three to eight CSI channels (SPI-compatible with master/slave modes). All interfaces are configurable via peripheral I/O redirection registers (PIOR0/1), enabling flexible pin assignment without PCB redesign.

How does the Event Link Controller (ELC) enhance real-time responsiveness in the R5F104MJAFB#50?

The ELC in the R5F104MJAFB#50 enables hardware-level chaining of up to 26 peripheral events - for example, triggering an ADC conversion upon a timer match, then automatically transferring the result via DTC to a UART buffer, all without CPU involvement. This reduces interrupt latency to sub-microsecond levels and frees the CPU for higher-layer tasks, improving determinism in time-critical sensor fusion or motor control loops.

What is the flash library RAM usage requirement for self-programming on the R5F104MJAFB#50?

The R5F104MJAFB#50 requires 256 bytes of RAM starting at address F9F00H for the Flash Self-Programming Library (FSL). This RAM area is reserved exclusively for flash operations - including erase, write, and verification - and must not be used by application code. The FSL supports boot swapping and flash shield window protection to prevent unauthorized access during firmware updates.