Renesas R5F21276SNFP#U0

Overview

R5F21276SNFP from Renesas Electronics is a 16-bit R8C/27 Group single-chip microcontroller with 32 KB flash program memory, 1.5 KB RAM, and dual 1 KB data flash blocks. It integrates an 89-instruction R8C CPU core, 12-channel 10-bit A/D converter, UART0/UART1 serial interfaces, I²C bus interface, hardware LIN module, and four 8-/16-bit timers (RA, RB, RC, RE). It targets embedded control in consumer appliances and industrial equipment operating at -20 to +85°C.

For engineers reviewing the R5F21276SNFP datasheet, R5F21276SNFP pinout, R5F21276SNFP application, or R5F21276SNFP equivalent, key selection criteria include its 32-pin LQFP package (PLQP0032GB-A), on-chip data flash endurance (10,000 erase/write cycles), real-time clock capability via Timer RE, and support for low-power wait/stop modes (2.0 µA / 0.7 µA at 3.0 V).

Technical Context

The R5F21276SNFP implements the R8C CPU core with two register banks, 20-bit program counter, and 11-bit flag register supporting carry, zero, sign, overflow, and interrupt priority level flags. Its memory map spans 1 Mbyte (00000h–FFFFFh), with fixed interrupt vectors at FFDCh–FFFFh and SFRs mapped to 00000h–002FFh.

Peripheral integration includes Timer RC with input capture/output compare, Timer RE with real-time clock and compare match (N/D version), hardware LIN using Timer RA and UART0, and dual data flash blocks enabling independent firmware/data storage. Clock generation supports XIN (up to 20 MHz), on-chip high-speed oscillator with frequency adjustment, and XCIN/XCOUT (32 kHz) for RTC operation.

Key Specifications

Pinout & Package

Package: 32-pin molded-plastic LQFP (PLQP0032GB-A), 7 mm × 7 mm, 0.8 mm pitch, exposed pad not specified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21276SNFP, R5F21276SDFP extends temperature range for harsher environments while R5F21274SNFP reduces memory capacity to lower cost-both retain identical pinout, peripherals, and data flash architecture for seamless migration.

Availability

R5F21276SNFP is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, consumer audio systems, and automotive body controllers requiring stable component supply and long-term production continuity.

Supply support for R5F21276SNFP 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 automotive, industrial, and IoT markets.

The R8C/27 Group, including R5F21276SNFP, was designed for cost-sensitive, low-power embedded control in consumer and industrial equipment-emphasizing integrated peripherals, data flash reliability, and simplified system design.

FAQ

What is the maximum operating frequency and supply voltage range for R5F21276SNFP?

R5F21276SNFP operates at up to 20 MHz with VCC = 3.0–5.5 V, or at reduced frequencies down to 5 MHz with VCC as low as 2.2 V. Its minimum instruction execution time is 50 ns under 20 MHz/3.0–5.5 V conditions, enabling responsive real-time control in commercial applications.

Does R5F21276SNFP include on-chip data flash, and what is its endurance rating?

Yes, R5F21276SNFP includes two 1 KB data flash blocks with 10,000 erase/write cycles. This allows robust nonvolatile storage for calibration data, device configuration, or firmware update staging-distinct from the 32 KB program flash (1,000-cycle endurance).

Which timer modules in R5F21276SNFP support real-time clock (RTC) functionality?

Timer RE provides real-time clock functionality in R5F21276SNFP when used with the 32 kHz XCIN/XCOUT crystal oscillator (N/D version only). It supports both RTC counting and compare match events, enabling alarm generation and periodic wake-up from low-power modes.

Can R5F21276SNFP operate in low-power modes, and what are the typical current draws?

Yes, R5F21276SNFP supports wait and stop modes. Typical current consumption is 2.0 µA in wait mode (VCC = 3.0 V, f(XCIN) = 32 kHz) and 0.7 µA in stop mode (VCC = 3.0 V), making it suitable for battery-powered or energy-harvesting sensor applications.

Is hardware LIN communication supported on R5F21276SNFP, and how is it implemented?

Yes, R5F21276SNFP includes a hardware LIN 2.0/2.1 module implemented using Timer RA and UART0. It handles LIN protocol framing, checksum calculation, and synchronization automatically-reducing CPU load and ensuring timing compliance without software stack intervention.