Renesas R5F10RB8AFP#50

Overview

R5F10RB8AFP#50 from Renesas is an 8 KB flash, 1 KB RAM, 32-pin LQFP RL78/L12 microcontroller optimized for ultra-low-power LCD-based applications. It integrates an on-chip LCD controller/driver (up to 35 seg × 4 com), operates from 1.6 V to 5.5 V, delivers 31 DMIPS at 24 MHz, and achieves 0.64 µA RTC+LVD halt current - ideal for battery-powered medical meters and portable instrumentation.

For engineers reviewing the R5F10RB8AFP#50 datasheet, R5F10RB8AFP#50 pinout, R5F10RB8AFP#50 application, or R5F10RB8AFP#50 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, and confirmed alternative options for cost- or feature-sensitive designs requiring integrated LCD drive and sub-µA standby.

Technical Context

The R5F10RB8AFP#50 implements the 16-bit RL78 CPU core with Harvard architecture and 3-stage pipeline, enabling 86% of instructions in 1–2 clock cycles and 16×16 multiply in 1 cycle. Its low-power design includes multiple clock domains: high-speed on-chip oscillator (24 MHz ±1% over voltage/temperature), subsystem clock (32.768 kHz crystal support), and low-speed internal oscillator (15 kHz).

It embeds a full-featured LCD controller supporting capacitor split, internal boost, and resistance division methods with 16-step contrast control and blinking; plus safety features including flash CRC, RAM parity check, SFR write protection, and illegal memory access detection compliant with IEC/UL 60730.

Key Specifications

Pinout & Package

32-pin plastic LQFP (7 mm × 7 mm, 0.8 mm pitch), RoHS-compliant, operating ambient temperature −40°C to +85°C (Consumer grade).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10RB8AFP#50, R5F10RBAAFP#50 offers double flash capacity in identical form factor for seamless scalability, while R5F10RF8AFP#50 trades compactness for expanded I/O and LCD drive capability - both retain the same ultra-low-power architecture and toolchain compatibility.

Availability

R5F10RB8AFP#50 is available at Aetrix Electronics and suitable for medical glucose meters, smart thermostats, industrial panel meters, and portable multimeters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for R5F10RB8AFP#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/L12 product line targets ultra-low-power, LCD-integrated applications such as portable instrumentation and consumer displays - designed to minimize system-level BOM and maximize battery life without sacrificing processing capability.

FAQ

What is the maximum operating frequency and associated performance of the R5F10RB8AFP#50?

The R5F10RB8AFP#50 operates at up to 24 MHz using its high-speed on-chip oscillator, delivering 31 DMIPS of processing performance. Its 16-bit RL78 core executes 86% of instructions in 1–2 clock cycles, and the 16×16 multiply-accumulate unit completes operations in 1–2 cycles - enabling responsive real-time control in LCD-based metering applications where the R5F10RB8AFP#50 is deployed.

Does the R5F10RB8AFP#50 support external crystal oscillators, and what are the options?

Yes, the R5F10RB8AFP#50 supports external crystals on X1/X2 pins for main system clock (1–20 MHz) and XT1/XT2 pins for subsystem clock (32.768 kHz). It also accepts external clock inputs on EXCLK and EXCLKS. The on-chip 24 MHz oscillator provides ±1% accuracy across 1.8–5.5 V and −20°C to 85°C - eliminating crystal cost and board space unless higher precision or low-jitter timing is required in the R5F10RB8AFP#50 design.

How many LCD segments and commons does the R5F10RB8AFP#50 support, and what drive methods are available?

The R5F10RB8AFP#50 supports up to 35 segments × 4 commons (140 segments) or 39 segments × 4 commons using its integrated LCD controller. It implements three drive methods: capacitor split, internal voltage boost (0.63 µA @ 3.0 V), and external resistance division - allowing optimization for power, contrast, or external component count depending on display type and battery constraints in the R5F10RB8AFP#50 implementation.

What safety features does the R5F10RB8AFP#50 include for IEC/UL 60730 compliance?

The R5F10RB8AFP#50 includes flash memory CRC calculation, RAM parity error detection, RAM write protection, SFR write protection, illegal memory access detection, clock frequency monitoring, and ADC self-test - all documented in Renesas' functional safety documentation for RL78/L12. These features enable certified Class B appliance designs without external safety monitors, directly supporting compliance workflows for the R5F10RB8AFP#50 in regulated consumer and industrial equipment.

Can the R5F10RB8AFP#50 operate from a single 1.6 V supply, and what peripherals remain functional at that voltage?

Yes, the R5F10RB8AFP#50 operates from 1.6 V to 5.5 V. At 1.6 V, the 10-bit ADC (with internal 1.45 V reference), LCD controller (capacitor split method), real-time clock, and low-voltage detector remain fully functional. The high-speed on-chip oscillator is limited to ≤4 MHz in LV mode, but the 15 kHz watchdog timer and 32.768 kHz subsystem clock continue operation - ensuring robust low-voltage behavior critical for the R5F10RB8AFP#50 in energy-harvesting or coin-cell applications.