Renesas R5F21236JFP#U1

Overview

R5F21236JFP from Renesas Electronics is a 16-bit R8C/23 Group microcontroller with CAN 2.0B interface, 32 KB program flash, 2 KB RAM, and 1 KB × 2 data flash-designed for automotive and industrial networking applications operating at 20 MHz (V_CC = 3.0–5.5 V) in a 48-pin LQFP package.

For engineers reviewing the R5F21236JFP datasheet, R5F21236JFP pinout, R5F21236JFP application, or R5F21236JFP equivalent, key selection considerations include its integrated CAN module with 16 message slots, 10-bit 12-channel ADC, hardware LIN support via UART0+TimerRA, and -40°C to +85°C industrial temperature grade.

Technical Context

The R5F21236JFP implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz). It features dual clock generation circuits-including high-speed on-chip oscillator with frequency adjustment-and supports single-chip operation with 1 Mbyte address space.

Peripheral integration includes Timer RA/RB (8-bit), Timer RD (16-bit × 2 with input capture/output compare), Timer RE (compare match), UART0/UART1, I²C bus interface (2), hardware LIN (using TimerRA+UART0), and a CAN 2.0B module with dedicated SFR area (01300h–0147Fh) and 16 message buffer slots.

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 R5F21237JFP, R5F21236JFP offers lower code density but identical real-time performance and peripheral latency; versus R5F21226JFP, it adds field-upgradable data storage without increasing pin count or thermal footprint.

Availability

R5F21236JFP is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN gateways, factory automation sensor nodes, and medical diagnostic equipment interfaces requiring stable component supply across extended product lifecycles.

Supply support for R5F21236JFP 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.

The R8C/23 Group, including R5F21236JFP, was engineered for cost-optimized, real-time automotive and industrial control applications requiring integrated CAN, LIN, and mixed-signal capability in compact LQFP packages.

FAQ

What is the maximum operating frequency of the R5F21236JFP and under what conditions?

The R5F21236JFP achieves a maximum operating frequency of 20 MHz when powered at V_CC = 3.0–5.5 V. At this speed, the minimum instruction execution time is 50 ns. Operation at 10 MHz is supported down to V_CC = 2.7 V, enabling flexible power/performance trade-offs in battery-powered or low-voltage industrial systems. The R5F21236JFP uses an on-chip high-speed oscillator with frequency adjustment or external crystal (XIN/XOUT) for precise timing.

Does the R5F21236JFP include on-chip data flash memory, and what is its endurance rating?

Yes, the R5F21236JFP includes 1 KB × 2 blocks of on-chip data flash memory, specifically allocated at addresses 02400h–02BFFh. This memory is rated for 10,000 erase/write cycles-significantly higher than the 1,000-cycle endurance of the main program flash-making it suitable for frequently updated calibration data, configuration parameters, or firmware update staging. The R5F21236JFP data flash operates within the same V_CC range (2.7–5.5 V) as program execution.

How many analog input channels does the R5F21236JFP support, and what is the ADC resolution?

The R5F21236JFP integrates a single 10-bit successive-approximation ADC with 12 analog input channels (AN0–AN11), accessible via dedicated pins on ports P0, P1, and P4. Input voltage range is referenced to AVCC/AVSS or an external voltage applied to the VREF pin. The ADC supports programmable sampling time and conversion triggers from timers or software, enabling synchronized sensor acquisition in real-time control loops using the R5F21236JFP.

What peripheral modules are included in the R5F21236JFP for automotive communication protocols?

The R5F21236JFP integrates a full CAN 2.0B controller with 16 message slots and dedicated SFR area (01300h–0147Fh), plus a hardware LIN module combining UART0 and TimerRA to implement LIN 2.0/2.1 without CPU intervention. It also provides two UART channels (UART0/UART1), I²C bus interface (2), and clock-synchronous serial I/O with chip select-enabling multi-protocol gateway functionality. All these peripherals are fully functional in the R5F21236JFP's -40°C to +85°C operating range.

Is the R5F21236JFP pin-compatible with other members of the R8C/23 Group, and what package does it use?

Yes, the R5F21236JFP is pin-compatible with all R8C/23 Group MCUs in the PLQP0048KB-A package-including R5F21237JFP, R5F21238JFP, and R5F2123AJFP-sharing identical 48-pin LQFP mechanical dimensions (7 mm × 7 mm, 0.5 mm pitch) and pin functions. This allows scalable design reuse: firmware and PCB layouts developed for R5F21236JFP can be reused with higher-memory variants without modification, simplifying qualification and migration paths for the R5F21236JFP.