Renesas R5F21348YJFP#W4

Overview

R5F21348YJFP#W4 from Renesas Electronics is a 16-bit R8C/27 Group single-chip microcontroller with 32 KB flash program memory, 1.5 KB RAM, and dual 1 KB data flash blocks. It operates at up to 20 MHz (50 ns min instruction time), supports 12-channel 10-bit A/D conversion, and integrates UART0/UART1, I²C, LIN, and four 8-/16-bit timers - deployed in automotive body control modules requiring robust timing, sensor interfacing, and serial communication.

For engineers reviewing the R5F21348YJFP#W4 datasheet, R5F21348YJFP#W4 pinout, R5F21348YJFP#W4 application, or R5F21348YJFP#W4 equivalent, key selection criteria include its -40°C to +85°C industrial temperature grade (J version), 32-pin LQFP package (PLQP0032GB-A), on-chip real-time clock (Timer RE), hardware LIN compliance, and low-power stop mode (0.7 µA @ 3.0 V).

Technical Context

The R5F21348YJFP#W4 implements the R8C CPU core with 89 fundamental instructions and a 1 Mbyte address space. Its memory subsystem includes 32 KB of flash program ROM (1,000 erase/write cycles) and two independent 1 KB data flash blocks (10,000 cycles), enabling reliable firmware updates and nonvolatile parameter storage without external EEPROM.

Peripheral integration centers on deterministic real-time control: Timer RC provides 16-bit input capture/output compare; Timer RE delivers real-time clock functionality with compare match; UART0 pairs with Timer RA for hardware LIN 2.0 physical layer support; and the 10-bit A/D converter samples 12 analog inputs with programmable reference voltage (VREF pin).

Key Specifications

Pinout & Package

Package: 32-pin molded-plastic LQFP (PLQP0032GB-A, 7 mm × 7 mm, 0.8 mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21348YJFP#W4, R5F21276JFP offers identical hardware but lacks factory-programmed ROM content, while R5F21348YDFP matches all electrical and functional specs but carries D-version qualification paperwork - neither is pin-compatible drop-in replacement without verifying ROM initialization and test report alignment.

Availability

R5F21348YJFP#W4 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, smart home appliance controllers, and office equipment power management requiring stable component supply across extended product lifecycles.

Supply support for R5F21348YJFP#W4 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, and power devices for automotive, industrial, and IoT applications.

The R8C/27 Group, including R5F21348YJFP#W4, was designed for cost-sensitive, real-time embedded systems requiring integrated analog peripherals, LIN connectivity, and long-term supply stability in automotive and industrial environments.

FAQ

What is the maximum operating frequency and corresponding supply voltage requirement for R5F21348YJFP#W4?

R5F21348YJFP#W4 achieves a minimum instruction execution time of 50 ns at 20 MHz, requiring VCC ≥ 3.0 V. It supports lower frequencies down to 5 MHz at VCC = 2.2 V (N/D versions), but the J version specifies 2.7–5.5 V operation. This voltage-frequency envelope ensures deterministic timing for real-time control loops in automotive applications.

Does R5F21348YJFP#W4 include on-chip debug capability and what interface does it use?

Yes, R5F21348YJFP#W4 supports on-chip debugging via the single-wire background debug mode (BDM) using the RESET pin as the debug interface. This allows full breakpoint, step-through, and memory inspection without dedicated debug pins, simplifying PCB layout while maintaining development flexibility for the R5F21348YJFP#W4.

How is the data flash organized in R5F21348YJFP#W4 and what endurance does it offer?

R5F21348YJFP#W4 contains two independent 1 KB data flash blocks, each rated for 10,000 erase/write cycles. These blocks are mapped into the memory space separately from program flash and support byte-level writes and sector-level erases, enabling robust nonvolatile storage of calibration data, device IDs, or field-upgradable parameters within the R5F21348YJFP#W4.

Can R5F21348YJFP#W4 operate with an external 32.768 kHz crystal for real-time clock functions?

No - R5F21348YJFP#W4 does not support external 32 kHz crystals. The XCIN/XCOUT pins required for 32 kHz oscillation are only available on N and D versions (e.g., R5F21348YDFP), not the J version. Timer RE in R5F21348YJFP#W4 relies on the internal low-speed oscillator or derived clocks; accurate RTC operation requires calibration against a known time source.

What peripheral resources are shared with GPIO pins on R5F21348YJFP#W4 and how is multiplexing controlled?

R5F21348YJFP#W4 uses register-based peripheral function selection: pins like P0_0 (AN7/TXD1), P1_4 (TXD0), and P3_5 (SCL/TRCIOD) share roles. The PMR (Port Mode Register) and PINSR (Pin Select Register) configure each pin's active function. This allows dynamic reassignment in firmware - for example, using P1_4 as TXD0 during communication and as GPIO during idle - without hardware changes to the R5F21348YJFP#W4.