Renesas R5F21217KFP#U1

Overview

R5F21217KFP from Renesas Electronics is a 16-bit R8C/21 Group microcontroller featuring an R8C CPU core, 48 KB program flash ROM, 2.5 KB RAM, and dual 1 KB data flash blocks for nonvolatile parameter storage. It operates at up to 20 MHz (V_CC = 3.0–5.5 V), supports -40°C to +125°C ambient temperature, and integrates 12-channel 10-bit ADC, hardware LIN module, UARTs, I²C, and multiple timers - deployed in automotive body control modules requiring robust embedded timing and communication.

For engineers reviewing the R5F21217KFP datasheet, R5F21217KFP pinout, R5F21217KFP application, or R5F21217KFP equivalent, key selection criteria include its K-version extended temperature rating, on-chip high-speed oscillator with frequency adjustment, dual data flash endurance (10,000 erase/write cycles), LIN-compliant UART0+TimerRA pairing, and 48-pin LQFP package with 41 general-purpose I/O pins.

Technical Context

The R5F21217KFP implements the R8C CPU core with 89 fundamental instructions and executes at 50 ns minimum instruction time (20 MHz, 3.0–5.5 V). Its memory architecture includes 1 Mbyte address space, fixed interrupt vector table at 0FFDCh–0FFFFh, and segregated program ROM (04000h–0FFFFh) and data flash (02400h–02BFFh) regions.

Peripheral integration centers on deterministic real-time control: Timer RD provides two 16-bit channels with input capture/output compare; LIN module combines UART0 and Timer RA for ISO 17987-compliant serial communication; and the 10-bit A/D converter supports simultaneous sampling across 12 analog inputs with internal reference voltage support via VREF pin.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21217KFP, R5F21217JFP offers lower-temperature qualification at reduced cost, while R5F21218KFP provides expanded program memory - both maintain identical pinout, data flash architecture, and LIN timing capability for seamless migration.

Availability

R5F21217KFP is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor controllers, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for R5F21217KFP 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 devices for automotive and industrial markets.

The R8C/21 Group, including R5F21217KFP, was designed for cost-sensitive, high-reliability automotive sub-systems requiring integrated LIN communication, data logging, and extended temperature operation without external timing components.

FAQ

What is the maximum operating frequency of the R5F21217KFP and under what conditions?

The R5F21217KFP achieves a maximum operating frequency of 20 MHz when powered at V_CC = 3.0–5.5 V. At this frequency, the minimum instruction execution time is 50 ns. Operation at 16 MHz is supported across the same voltage range, and 10 MHz operation extends the voltage range down to 2.7 V - enabling flexible power/performance trade-offs in automotive environments.

Does the R5F21217KFP include hardware support for LIN communication?

Yes, the R5F21217KFP integrates a dedicated hardware LIN module that pairs UART0 with Timer RA to implement the ISO 17987 physical layer. This eliminates software-based bit timing, ensures precise synchronization, and reduces CPU load during LIN frame transmission and reception - a key differentiator for automotive body control applications.

How many data flash blocks does the R5F21217KFP have, and what is their endurance rating?

The R5F21217KFP contains two independent 1 KB data flash blocks (total 2 KB), each rated for 10,000 erase/write cycles. These blocks are mapped to memory addresses 02400h–027FFh (Block A) and 02800h–02BFFh (Block B), supporting wear-leveling algorithms and EEPROM emulation for calibration data and user settings.

What is the purpose of the VREF pin on the R5F21217KFP?

The VREF pin on the R5F21217KFP serves as an external reference voltage input for the 10-bit A/D converter. When driven with a stable voltage (e.g., 2.5 V or 3.3 V), it defines the full-scale range of the ADC, enabling accurate and repeatable analog measurements independent of V_CC fluctuations - essential for sensor signal conditioning in automotive systems.

Is the R5F21217KFP pin-compatible with other members of the R8C/21 Group?

Yes, all R8C/21 Group MCUs, including R5F21217KFP, share identical 48-pin LQFP (PLQP0048KB-A) packaging and pin assignments. This allows direct substitution between variants (e.g., R5F21216KFP, R5F21218KFP) without PCB redesign - only firmware and memory map adjustments are required to accommodate differing ROM/RAM capacities and feature sets.