Renesas R4F20102NFA#U0

Overview

R4F20102NFA#U0 from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/Tiny series, designed for embedded control applications requiring low power consumption and integrated peripherals. It features 64 KB on-chip flash memory, 4 KB RAM, a 20 MHz max CPU clock, 57 I/O pins, and supports CAN 2.0B interface via dedicated controller. It is commonly used in industrial sensor nodes and motor control modules where deterministic real-time response and compact footprint are critical.

For engineers reviewing the R4F20102NFA#U0 datasheet, R4F20102NFA#U0 pinout, R4F20102NFA#U0 application, or R4F20102NFA#U0 equivalent, key selection considerations include its H8S/20103-compatible instruction set, 3.3 V operation with 5 V-tolerant I/O, integrated watchdog timer with window function, and support for both internal PLL and external crystal oscillator configurations.

Technical Context

The R4F20102NFA#U0 implements the H8S/2000 CPU core with 24-bit address space, supporting advanced mode for extended register access and enhanced interrupt handling. It integrates a programmable clock pulse generator (CPG) with PLL, low-voltage detection (LVD), and a data transfer controller (DTC) for autonomous peripheral-to-memory transfers without CPU intervention.

Peripheral integration includes three asynchronous serial interfaces (SCI), one I²C bus interface, a 16-bit timer with compare match and input capture, and a 10-bit ADC with 8 channels. All peripherals are memory-mapped and controlled via special function registers (SFRs) accessible in both user and privileged modes.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), thermally enhanced with exposed pad (EPAD) connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F20103NFA#U0, the R4F20102NFA#U0 offers identical peripheral set and timing behavior but reduced flash capacity-ideal for cost-sensitive, fixed-function deployments. Against the R5F566TEADFP, it trades raw performance and safety features for lower power, smaller footprint, and mature toolchain stability in established industrial designs.

Availability

R4F20102NFA#U0 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart sensor nodes, and portable medical diagnostic equipment requiring stable component supply across multi-year production cycles.

Supply support for R4F20102NFA#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 headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The H8S/Tiny series-including the R4F20102NFA#U0-is engineered for cost-effective, low-power embedded control in space-constrained applications where reliability, long-term availability, and toolchain maturity outweigh raw processing throughput.

FAQ

What is the maximum operating frequency of the R4F20102NFA#U0?

The R4F20102NFA#U0 supports a maximum CPU clock frequency of 20 MHz. This is achieved using the on-chip PLL with an external crystal (e.g., 4 MHz) multiplied by 5, or directly from a high-frequency oscillator. The 20 MHz limit applies to all internal buses and peripherals, and timing specifications in the datasheet assume operation at this maximum rate under specified voltage and temperature conditions. The R4F20102NFA#U0 does not support overclocking beyond 20 MHz.

Does the R4F20102NFA#U0 support in-circuit debugging?

Yes, the R4F20102NFA#U0 supports in-circuit debugging via the on-chip debug interface (OCDS) using the standard 6-pin connector (VCC, VSS, TDI, TDO, TCK, TMS). It enables full breakpoint, watchpoint, and real-time variable monitoring without halting peripheral operation. Debug access requires Renesas E2 emulator or compatible JTAG/SWD probe, and the R4F20102NFA#U0 must be configured with debug enable fuse unblown during programming.

Is the R4F20102NFA#U0 pin-compatible with other H8S/2010x devices?

Yes, the R4F20102NFA#U0 is fully pin-compatible with R4F20103NFA#U0 and R4F20115NFA#U0 in the same 100-pin LQFP package. Pin assignments for power, reset, clocks, I/O, and peripheral functions are identical across these variants. Firmware developed for R4F20102NFA#U0 will run unchanged on R4F20103NFA#U0, though the latter provides additional flash and SCI resources that remain unused unless explicitly accessed.

What is the role of the Event Link Controller (ELC) in the R4F20102NFA#U0?

The Event Link Controller (ELC) in the R4F20102NFA#U0 enables hardware-triggered peripheral activation without CPU intervention-for example, initiating ADC conversion upon timer compare match or starting PWM output on external edge detection. It supports 16 event sources and 8 destinations, with configurable priority and masking. This offloads timing-critical tasks from firmware, reducing jitter and CPU utilization. The ELC is integral to deterministic real-time behavior in the R4F20102NFA#U0's control applications.

Can the R4F20102NFA#U0 operate from a single 3.3 V supply without level shifters?

Yes, the R4F20102NFA#U0 operates from a single 3.3 V supply (3.0–3.6 V range) and features 5 V-tolerant I/O pins. This allows direct connection to 5 V peripherals-such as legacy sensors or displays-without external level shifters. Internal protection clamps limit input voltage to VCC + 0.3 V, and the 5 V tolerance is guaranteed across the full operating temperature range. However, output drive strength remains rated for 3.3 V logic levels.