Renesas R5F21236KFP#W4

Overview

R5F21236KFP from Renesas Electronics is a 16-bit R8C/23 Group microcontroller with CAN 2.0B interface, 32 KB program flash, 2 KB RAM, and 2×1 KB data flash blocks-designed for automotive and industrial networking applications operating at -40°C to +125°C. It integrates a 10-bit 12-channel ADC, dual UARTs, LIN hardware module, I²C interface, and multiple timers including 16-bit Timer RD with input capture/output compare.

For engineers reviewing the R5F21236KFP datasheet, R5F21236KFP pinout, R5F21236KFP application, or R5F21236KFP equivalent, key selection considerations include its K-version extended temperature rating, embedded data flash endurance (10,000 erase/write cycles), CAN 2.0B compliance with 16 message slots, and LQFP-48 package compatibility with PLQP0048KB-A footprint.

Technical Context

The R5F21236KFP implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz XIN, 3.0–5.5 V). Its memory architecture includes separate program ROM and data flash regions, with fixed interrupt vector table at 0FFDCh–0FFFFh and SFR space spanning 00000h–002FFh and 01300h–0147Fh for CAN peripherals.

Peripheral integration centers on deterministic real-time control: Timer RD provides two 16-bit channels with input capture and output compare for motor timing; hardware LIN uses Timer RA and UART0; CAN module supports full 2.0B protocol with message filtering and transmit/receive FIFO management via dedicated SFR registers.

Key Specifications

Pinout & Package

Package: 48-pin plastic LQFP (PLQP0048KB-A), 7 mm × 7 mm body, 0.5 mm pin pitch, exposed pad not specified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21236JFP, the R5F21236KFP provides guaranteed operation at +125°C for under-hood use, while R5F21237KFP offers expanded program memory without altering thermal or peripheral specifications-enabling drop-in upgrades where flash capacity is limiting.

Availability

R5F21236KFP is available at Aetrix Electronics and suitable for automotive networking, industrial PLC I/O, and high-temperature sensor interface applications requiring stable component supply across extended product lifecycles.

Supply support for R5F21236KFP 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/23 Group, including R5F21236KFP, was designed for cost-sensitive, high-reliability embedded control in automotive body electronics and industrial automation where CAN/LIN connectivity and extended temperature operation are essential.

FAQ

What is the maximum operating frequency of the R5F21236KFP?

The R5F21236KFP supports a maximum external crystal frequency of 20 MHz, achieving a minimum instruction execution time of 50 ns under 3.0–5.5 V supply conditions. Its on-chip high-speed oscillator is adjustable and usable as primary clock source, though system timing accuracy depends on external crystal stability for CAN/LIN compliance.

Does the R5F21236KFP include a hardware LIN interface?

Yes, the R5F21236KFP integrates a dedicated hardware LIN module compliant with LIN 2.0/2.1 standards, implemented using Timer RA and UART0. This eliminates software-based bit-banging, ensures strict baud rate tolerance (±1.5%), and reduces CPU load during LIN frame transmission and reception.

How many CAN message buffers does the R5F21236KFP support?

The R5F21236KFP CAN module provides 16 configurable message slots for both transmission and reception, supporting identifier filtering, priority arbitration, and automatic retransmission. These slots are managed via dedicated SFRs in the 01300h–0147Fh address range and do not consume main RAM.

What is the data flash endurance specification for the R5F21236KFP?

The R5F21236KFP includes two 1 KB data flash blocks rated for 10,000 erase/write cycles per block. This endurance level supports frequent parameter updates in automotive calibration systems and industrial configuration storage without premature wear-out.

Is the R5F21236KFP pin-compatible with other R8C/23 Group devices?

Yes, all R8C/23 Group MCUs-including R5F21236KFP, R5F21237KFP, and R5F21238KFP-share identical 48-pin LQFP (PLQP0048KB-A) packaging and pin assignments. Firmware and PCB layouts are interchangeable across this family when memory size and temperature grade meet design requirements.