Renesas R5F21255SNFP#V2

Overview

R5F21255SNFP#V2 from Renesas Electronics is a 16-bit single-chip CMOS microcontroller in the R8C/25 Group, featuring an R8C/Tiny Series CPU core, 24 KB flash program memory, 2 KB RAM, and 2 KB on-chip data flash (1 KB × 2 blocks). It operates at up to 20 MHz (50 ns min. instruction time), supports 12-channel 10-bit A/D conversion, hardware LIN bus via UART0/timer RA, and real-time clock functionality in timer RE. It targets embedded control in consumer appliances requiring compact, low-power, mixed-signal integration.

For engineers reviewing the R5F21255SNFP#V2 datasheet, R5F21255SNFP#V2 pinout, R5F21255SNFP#V2 application, or R5F21255SNFP#V2 equivalent, key selection considerations include its 52-pin LQFP (PLQP0052JA-A) package, -20°C to +85°C operating range (N version), integrated LIN module, dual data flash blocks for EEPROM emulation, and support for wait/stop low-power modes down to 0.7 µA.

Technical Context

The R5F21255SNFP#V2 implements the R8C/Tiny CPU core with 89 fundamental instructions and a 1 Mbyte address space, enabling efficient C-language execution and interrupt handling across 7 priority levels. Its peripheral set includes two UARTs (UART0/UART1), one I²C interface, one clock-synchronous serial I/O with chip select, and four independent timers (RA, RB, RD×2, RE) with input capture, output compare, and RTC functions.

It integrates three clock generation circuits: XIN-based (up to 20 MHz), high-speed on-chip oscillator (frequency-adjustable), and XCIN-based 32 kHz real-time clock source - all supported by oscillation stop detection and on-chip power-on reset. The device uses CMOS I/O ports (41 general-purpose + 3 input-only pins), with P2_0–P2_7 configurable as LED drive outputs, and includes on-chip voltage detection and watchdog timer (15-bit with prescaler).

Key Specifications

Pinout & Package

Package: 52-pin molded-plastic LQFP (PLQP0052JA-A), 0.65 mm pin pitch, 10 mm × 10 mm body size, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21255SNFP#V2, R5F21256SNFP offers greater program memory for complex firmware, while R5F21245SNFP removes data flash to reduce cost - making R5F21255SNFP#V2 the optimal balance of EEPROM-like functionality, code capacity, and price for mid-tier embedded control.

Availability

R5F21255SNFP#V2 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, consumer audio systems, and smart lighting controllers requiring stable component supply and long-term manufacturing continuity.

Supply support for R5F21255SNFP#V2 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 Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and consumer markets.

The R8C/25 Group, including R5F21255SNFP#V2, was designed for cost-effective, low-power embedded control in appliances and industrial equipment - emphasizing integrated peripherals, flash reliability, and broad operating temperature support.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for R5F21255SNFP#V2?

The R5F21255SNFP#V2 supports a maximum operating frequency of 20 MHz at a supply voltage of 3.0 V to 5.5 V. At lower frequencies - 10 MHz and 5 MHz - it operates down to 2.7 V and 2.2 V respectively, enabling flexible power scaling in battery-powered or low-voltage systems.

Does R5F21255SNFP#V2 include on-chip debug support, and what interface is used?

Yes, R5F21255SNFP#V2 includes on-chip debugging support via the single-wire debug interface using the RESET pin. This allows full breakpoint, step-through, and memory inspection capabilities without dedicated debug pins, preserving I/O count for application use.

How is the data flash organized in R5F21255SNFP#V2, and what is its endurance rating?

The R5F21255SNFP#V2 contains 2 KB of on-chip data flash structured as two independent 1 KB blocks. Each block is rated for 10,000 erase/write cycles under specified VCC conditions (2.7–5.5 V), supporting reliable parameter storage and firmware update staging.

Can R5F21255SNFP#V2 operate in extended temperature environments, and what versions are available?

The R5F21255SNFP#V2 is the N version, rated for -20°C to +85°C ambient operation. D version (R5F21255SDFP) supports -40°C to +85°C, and Y version (available on request) extends to -20°C to +105°C - all sharing identical pinout and functionality.

What peripheral resources does R5F21255SNFP#V2 provide for analog signal acquisition?

R5F21255SNFP#V2 integrates a 10-bit successive-approximation A/D converter with 12 input channels (AN0–AN11), programmable sample-and-hold, and selectable reference sources (internal or external via VREF pin), enabling precise measurement of sensors, potentiometers, and power rails.