Renesas R5F21264KFP#U0

Overview

R5F21264KFP#U0 from Renesas Electronics is a 16-bit R8C/26 Group single-chip microcontroller with 16 KB flash ROM, 1 KB RAM, 12-channel 10-bit A/D converter, UART0/UART1 serial interfaces, and hardware LIN module - designed for automotive body electronics and industrial control requiring operation up to 125°C ambient temperature.

For engineers reviewing the R5F21264KFP#U0 datasheet, R5F21264KFP#U0 pinout, R5F21264KFP#U0 application, or R5F21264KFP#U0 equivalent, this page delivers verified technical context, package mapping, real-world use scenarios, and validated alternative options for thermal-critical embedded designs.

Technical Context

The R5F21264KFP#U0 implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN clock, VCC = 3.0–5.5 V). It integrates three independent clock generation circuits: XIN-based crystal oscillator, high-speed/low-speed on-chip oscillators (with frequency adjustment), and XCIN-based 32 kHz RTC circuit (N/D versions only).

Peripheral resources include Timer RA/RB (8-bit × 2), Timer RC (16-bit input capture/output compare), Timer RE (real-time clock + 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 confirmed pin functions per Renesas REJ03B0168-0210.

Key Specifications

Pinout & Package

Package: 32-pin molded-plastic LQFP (PLQP0032GB-A, also designated FP in part numbering).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21264SDFP and R5F21274KFP, the R5F21264KFP#U0 uniquely balances automotive-grade thermal robustness (-40°C to +125°C), LIN integration, and cost efficiency - making it optimal for body control modules where data flash is unnecessary and ambient heat exceeds 85°C.

Availability

R5F21264KFP#U0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor drives, smart appliance power management, and factory automation sensor nodes requiring stable component supply across extended temperature ranges.

Supply support for R5F21264KFP#U0 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/26 Group, including R5F21264KFP#U0, was engineered for cost-sensitive, thermally demanding embedded control applications - delivering LIN-ready 16-bit performance with minimal external components.

FAQ

What is the maximum operating frequency of the R5F21264KFP#U0?

The R5F21264KFP#U0 supports a maximum XIN clock frequency of 20 MHz, achieving a minimum instruction execution time of 50 ns at VCC = 3.0–5.5 V. This timing is confirmed in Renesas document REJ03B0168-0210 Table 1.1 for K-version devices. The R5F21264KFP#U0 does not support higher frequencies - exceeding 20 MHz violates its rated electrical characteristics.

Does the R5F21264KFP#U0 include an integrated LIN physical layer?

No, the R5F21264KFP#U0 integrates only the LIN protocol controller (MAC layer) using UART0 and Timer RA - it requires an external LIN transceiver IC (e.g., TJA1020) for physical layer signaling. The hardware LIN module handles frame formatting, checksum calculation, and synchronization, but not bus driver/receiver functions. This is explicitly stated in Section 1.2 of REJ03B0168-0210.

What are the valid supply voltage ranges for the R5F21264KFP#U0?

The R5F21264KFP#U0 operates at VCC = 3.0 V to 5.5 V when using a 20 MHz XIN clock, as specified for K-version devices in Table 1.1 of REJ03B0168-0210. Unlike N/D versions, it does not support 2.2–2.7 V low-voltage operation. Supply below 3.0 V may cause undefined behavior or failure to meet timing specifications.

Can the R5F21264KFP#U0 operate without an external crystal?

Yes - the R5F21264KFP#U0 includes a high-speed on-chip oscillator with frequency adjustment capability, enabling crystal-free operation at reduced accuracy. However, for LIN compliance or precise timing (e.g., UART baud rate stability), an external crystal on XIN/XOUT is required. The on-chip oscillator alone does not meet LIN physical layer jitter requirements per ISO 17987.

Is the R5F21264KFP#U0 pin-compatible with other R8C/26 Group MCUs?

Yes - all R8C/26 Group devices, including R5F21264KFP#U0, share the identical PLQP0032GB-A 32-pin LQFP package and pinout per Figure 1.4 and Table 1.5 in REJ03B0168-0210. Memory size (8/16/24/32 KB) and temperature grade (N/D/J/K) do not affect pin assignment - only functional enablement (e.g., XCIN/XCOUT unavailable in K version) differs by version.