Renesas R5F21266SDFP#V2

Overview

R5F21266SDFP#V2 from Renesas Electronics is a 16-bit R8C/26 Group single-chip microcontroller with 32 KB flash ROM, 1.5 KB RAM, 12-channel 10-bit A/D converter, UART0/UART1 serial interfaces, and hardware LIN module - designed for embedded control in industrial and automotive subsystems operating from −40°C to +85°C.

For engineers reviewing the R5F21266SDFP#V2 datasheet, R5F21266SDFP#V2 pinout, R5F21266SDFP#V2 application, or R5F21266SDFP#V2 equivalent, this MCU delivers deterministic real-time performance via its 89-instruction R8C CPU core, on-chip oscillators (including 32 kHz XCIN support), and low-power wait/stop modes with sub-µA current draw - critical for battery-backed and thermally constrained designs.

Technical Context

The R5F21266SDFP#V2 implements the R8C CPU core with 20-bit program counter, dual register banks, and 11-bit flag register supporting seven interrupt priority levels. It integrates three clock generation circuits: XIN-based crystal/resonator oscillator, high-speed/low-speed on-chip oscillators (with frequency adjustment), and XCIN/XCOUT 32 kHz RTC oscillator - exclusive to D/N versions.

Peripheral integration includes Timer RA/RB (8-bit × 2), Timer RC (16-bit with input capture/output compare), Timer RE (real-time clock with compare match), two UART channels, one I²C bus interface, one clock-synchronous serial I/O with chip select, and hardware LIN transceiver using Timer RA and UART0 - all mapped to a fixed 32-pin LQFP package with verified pin assignments.

Key Specifications

Pinout & Package

Package: 32-pin molded-plastic LQFP (PLQP0032GB-A, also designated 32P6U-A).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21266SNFP, the R5F21266SDFP#V2 offers wider temperature tolerance for harsh environments; compared with R5F21276SDFP, it trades data flash endurance for lower cost and identical code-execution capability - making it optimal for fixed-function, temperature-critical control tasks.

Availability

R5F21266SDFP#V2 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, home appliance motor control, and office equipment power management requiring stable component supply across extended temperature ranges.

Supply support for R5F21266SDFP#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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions for industrial and automotive markets.

The R8C/26 Group, including R5F21266SDFP#V2, was engineered for cost-sensitive, real-time embedded control in thermally demanding environments - emphasizing low-power operation, integrated peripherals (LIN, I²C, A/D), and robust qualification across −40°C to +85°C.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for R5F21266SDFP#V2?

The R5F21266SDFP#V2 achieves a minimum instruction execution time of 50 ns at 20 MHz system clock, requiring VCC = 3.0–5.5 V. Its D version rating permits operation down to 2.2 V at reduced frequencies (e.g., 100 ns at 10 MHz), enabling flexible power supply design in mixed-voltage systems.

Does R5F21266SDFP#V2 include on-chip data flash memory?

No, R5F21266SDFP#V2 belongs to the R8C/26 Group and contains only program flash ROM (32 KB). Data flash (1 KB × 2 blocks) is exclusive to the R8C/27 Group, such as R5F21276SDFP. This makes R5F21266SDFP#V2 suitable for fixed-function firmware without runtime parameter storage needs.

Which pins support the hardware LIN interface on R5F21266SDFP#V2?

The hardware LIN module in R5F21266SDFP#V2 uses Timer RA and UART0 resources. Specifically, LIN transmit/receive signals map to P3_7 (RXD1/TXO1) and P1_4/P1_5 (TXD0/RXD0) - confirmed in the pin function table and Figure 1.4 pin assignments for the 32-pin LQFP package.

What is the purpose of the XCIN/XCOUT pins on R5F21266SDFP#V2?

XCIN and XCOUT on R5F21266SDFP#V2 provide a dedicated 32 kHz crystal oscillator circuit for Timer RE's real-time clock function. These pins are available only on D and N versions and enable ultra-low-power timekeeping during wait/stop modes - critical for battery-operated applications requiring accurate time stamps without waking the CPU.

How many interrupt sources and priority levels does R5F21266SDFP#V2 support?

R5F21266SDFP#V2 supports 23 total interrupt sources: 15 internal (e.g., timer overflows, A/D completion), 4 external (INT0–INT3), and 4 software interrupts. It implements 7 programmable priority levels via the 3-bit IPL field in the FLG register - enabling deterministic nested interrupt handling for time-critical control loops.