Renesas R5F21256SNFP#X6

Overview

R5F21256SNFP#X6 from Renesas Electronics is a 16-bit R8C/Tiny Series 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 requiring low-power operation and firmware update capability.

For engineers reviewing the R5F21256SNFP#X6 datasheet, R5F21256SNFP#X6 pinout, R5F21256SNFP#X6 application, or R5F21256SNFP#X6 equivalent, key selection criteria include its 52-pin LQFP package (PLQP0052JA-A), -20°C to +85°C operating range (N version), 2.2–5.5 V supply voltage support, and on-chip data flash endurance of 10,000 write/erase cycles.

Technical Context

The R5F21256SNFP#X6 implements the R8C/Tiny CPU core with 89 fundamental instructions and executes at up to 20 MHz (50 ns min. instruction time at VCC = 3.0–5.5 V). Its memory architecture separates 32 KB flash program ROM from two independent 1 KB data flash blocks-enabling background reprogramming without halting execution.

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. Clock sources comprise XIN (external crystal/resonator), high-speed/low-speed on-chip oscillators (with frequency adjustment), and XCIN (32 kHz RTC crystal).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21256SDFP and R5F21246SNFP, the R5F21256SNFP#X6 provides optimal balance of data flash capability, commercial temperature grade, and footprint compatibility - making it ideal for cost-sensitive, field-upgradable consumer electronics where ambient conditions remain within -20°C to +85°C.

Availability

R5F21256SNFP#X6 is available at Aetrix Electronics and suitable for home appliance control, office equipment motor sequencing, audio system remote interfaces, and industrial sensor nodes requiring stable component supply across multi-year production cycles.

Supply support for R5F21256SNFP#X6 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 the R5F21256SNFP#X6, was designed for cost-effective, low-power embedded control in resource-constrained consumer and office equipment - emphasizing integrated data flash, LIN readiness, and robust mixed-signal peripheral integration.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for the R5F21256SNFP#X6?

The R5F21256SNFP#X6 achieves a maximum operating frequency of 20 MHz at VCC = 3.0–5.5 V, with minimum instruction execution time of 50 ns. At lower frequencies (10 MHz, 5 MHz), it supports reduced supply voltages down to 2.2 V, enabling flexible power management in battery-powered designs.

Does the R5F21256SNFP#X6 support in-system programming of its data flash blocks?

Yes, the R5F21256SNFP#X6 supports in-system programming of both 1 KB data flash blocks using standard VCC (2.7–5.5 V) - no external high-voltage programmer required. Erase/write operations can be performed while executing code from main program flash, enabling seamless firmware parameter updates.

How many analog input channels does the R5F21256SNFP#X6 ADC support, and what is its resolution?

The R5F21256SNFP#X6 integrates a single 10-bit successive-approximation ADC with 12 dedicated analog input channels (AN0–AN11), accessible via P0_0–P0_7, P1_0–P1_3, and P4_2 (VREF). It supports internal or external reference voltage selection and programmable sample-and-hold timing.

What package type and pin count does the R5F21256SNFP#X6 use?

The R5F21256SNFP#X6 uses a 52-pin plastic LQFP package (PLQP0052JA-A) with 0.65 mm pin pitch and a 10 mm × 10 mm body. This footprint is shared across the R8C/24 and R8C/25 Groups, enabling design reuse between flash-only and data-flash-enabled variants.

Is the R5F21256SNFP#X6 qualified for automotive applications?

No, the R5F21256SNFP#X6 is an N-version device rated for -20°C to +85°C and classified as "Standard" quality grade per Renesas documentation - intended for consumer, office, and industrial equipment. For automotive use, the D-version (R5F21256SDFP) is required, with -40°C to +85°C rating and "High Quality" qualification.