Renesas R5F21256SNFP#V2

Overview

R5F21256SNFP#V2 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/25 Group, featuring 32 KB flash program memory, 2 KB RAM, and dual 1 KB data flash blocks for nonvolatile parameter storage. It integrates a 10-bit 12-channel ADC, UART0/UART1, I²C bus interface, hardware LIN module (using timer RA and UART0), and real-time clock (timer RE). It targets embedded control in consumer appliances and office equipment operating from 2.2 V to 5.5 V.

For engineers reviewing the R5F21256SNFP#V2 datasheet, R5F21256SNFP#V2 pinout, R5F21256SNFP#V2 application, or R5F21256SNFP#V2 equivalent, key selection criteria include its 52-pin LQFP (PLQP0052JA-A) package, -20°C to +85°C temperature grade (N version), on-chip high-speed oscillator with frequency adjustment, and support for wait/stop low-power modes down to 0.7 µA.

Technical Context

The R5F21256SNFP#V2 implements the R8C/Tiny Series CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN clock, 3.0–5.5 V). Its memory architecture separates 32 KB flash program ROM from two independent 1 KB data flash blocks-each rated for 10,000 erase/write cycles-enabling robust field-updatable configuration storage without affecting main firmware.

Peripheral integration includes Timer RD (16-bit × 2 channels with input capture/output compare), Timer RE (real-time clock with compare match), and dual UARTs supporting LIN physical layer compliance via UART0 and timer RA. Clock generation uses three independent circuits: XIN (20 MHz max), XCIN (32 kHz), and on-chip high-/low-speed oscillators-with oscillation stop detection for XIN.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R5F21256SDFP, the R5F21256SNFP#V2 offers lower-cost commercial-temperature operation but lacks extended thermal range; compared with R5F21246SNFP, it adds critical dual-block data flash for safe field updates-making it preferable for products requiring over-the-air configuration persistence.

Availability

R5F21256SNFP#V2 is available at Aetrix Electronics and suitable for home appliance control, office equipment interface, and consumer IoT sensor hub applications requiring stable component supply and long-term production continuity.

Supply support for R5F21256SNFP#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 enterprise markets.

The R8C/25 Group-including R5F21256SNFP#V2-is designed for cost-sensitive, low-power embedded control in consumer electronics, emphasizing integrated peripherals, flash flexibility, and simplified clocking.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for R5F21256SNFP#V2?

R5F21256SNFP#V2 achieves a maximum operating frequency of 20 MHz with a supply voltage range of 3.0 V to 5.5 V. At 10 MHz, it supports 2.7–5.5 V; at 5 MHz, it operates down to 2.2 V. These ranges are defined in the electrical characteristics section of the R8C/25 Group datasheet (Rev. 3.00, Feb 2008), and all timing parameters-including 50 ns minimum instruction execution-are validated within these conditions.

Does R5F21256SNFP#V2 support in-system programming (ISP) and what voltage is required?

Yes, R5F21256SNFP#V2 supports in-system programming via its on-chip debug interface. Programming and erasure of both program ROM and data flash require VCC = 2.7 V to 5.5 V, as specified in the Flash Memory section of the datasheet. No external high-voltage supply is needed-the MCU uses internal charge pumps, enabling field firmware updates using standard 3.3 V or 5 V system rails.

How many independent data flash blocks does R5F21256SNFP#V2 have, and what is their endurance rating?

R5F21256SNFP#V2 contains two independent 1 KB data flash blocks, each rated for 10,000 erase/write cycles. This separation allows one block to be rewritten while the other retains valid data-critical for fail-safe parameter storage during firmware updates. The rating is explicitly stated in Table 1.2 (Functions and Specifications for R8C/25 Group) of the official Renesas documentation.

Is R5F21256SNFP#V2 pin-compatible with other members of the R8C/25 Group in the same package?

Yes, all R8C/25 Group devices in the PLQP0052JA-A (52-pin LQFP) package-including R5F21254SNFP, R5F21255SNFP, R5F21256SNFP#V2, R5F21257SNFP, and R5F21258SNFP-share identical pin assignments and electrical characteristics. Memory size differences (16–64 KB ROM, 1–3 KB RAM) do not affect pin function mapping or peripheral availability.

What clock sources are available on R5F21256SNFP#V2 and how is the real-time clock implemented?

R5F21256SNFP#V2 provides three clock sources: XIN/XOUT (up to 20 MHz crystal/resonator), XCIN/XCOUT (32 kHz crystal for RTC), and on-chip high-/low-speed oscillators. The real-time clock is implemented in Timer RE, which accepts the 32 kHz signal from XCIN/XCOUT and provides programmable prescaling and compare-match interrupts-enabling accurate timekeeping with sub-second resolution and low power consumption.