Renesas R4F20102NFA#G0

Overview

R4F20102NFA#G0 from Renesas is a 16-bit single-chip microcontroller in the H8S/Tiny family, designed for embedded control applications requiring low power, compact footprint, 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 integrated modules including UART, SCI, I²C, 16-bit timers, and 10-bit ADC. It is commonly used in industrial sensors, motor control interfaces, and building automation controllers.

For engineers reviewing the R4F20102NFA#G0 datasheet, R4F20102NFA#G0 pinout, R4F20102NFA#G0 application, or R4F20102NFA#G0 equivalent, key selection criteria include Flash/RAM capacity, peripheral set (especially SCI/I²C/ADC), operating voltage range (2.7–5.5 V), and QFP-80 package compatibility with legacy H8S designs.

Technical Context

The R4F20102NFA#G0 implements the H8S/2000 CPU core with 24-bit address space, supporting both advanced and standard operating modes. It integrates a Clock Pulse Generator (CPG) with PLL, Low-Voltage Detection (LVD), and a Watchdog Timer (WDT) with independent clock source.

Peripheral functions include three serial interfaces (SCI0–SCI2), two I²C buses (IIC0/IIC1), up to 16-channel 10-bit ADC, and eight 16-bit timer channels with input capture/output compare capability - all mapped via Peripheral I/O Mapping Controller (PMC) for flexible pin assignment.

Key Specifications

Pinout & Package

The R4F20102NFA#G0 is housed in an 80-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) package, compatible with standard surface-mount assembly processes and legacy H8S layout footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F20103NFA#G0 and R4F20203NFA#G0, the R4F20102NFA#G0 provides optimal balance of Flash/RAM, serial interface count, and power efficiency for cost-sensitive, non-CAN embedded control - making it ideal for volume industrial and building automation designs where resource margins are tightly constrained.

Availability

R4F20102NFA#G0 is available at Aetrix Electronics and suitable for industrial sensor nodes, motor control interfaces, and building automation panels requiring stable component supply across multi-year production cycles.

Supply support for R4F20102NFA#G0 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The H8S/Tiny series - including the R4F20102NFA#G0 - was engineered for cost-effective, low-power embedded control in space-constrained applications where reliability and long-term supply stability are critical.

FAQ

What is the maximum operating frequency of the R4F20102NFA#G0?

The R4F20102NFA#G0 supports a maximum CPU clock frequency of 20 MHz when using the on-chip PLL with an external crystal or clock source. Its internal clock generator allows configuration of system clocks for peripherals independently - for example, running the CPU at 20 MHz while driving the SCI at 4 MHz for precise baud rate generation. This flexibility is documented in the CPG section of the Hardware User's Manual (Rev. 3.00, Sep 2010).

Does the R4F20102NFA#G0 support in-system programming of its Flash memory?

Yes, the R4F20102NFA#G0 supports in-application programming (IAP) of its 64 KB on-chip Flash memory using standard firmware routines. This capability enables field firmware updates without requiring external programmers. The Flash control registers (FCTL) and sector protection mechanisms are fully accessible via the CPU, and the process is detailed in Section 12 of the Hardware User's Manual.

What package type and pin count does the R4F20102NFA#G0 use?

The R4F20102NFA#G0 uses an 80-pin LQFP package (7 mm × 7 mm, 0.5 mm pitch), designated as "NFA" in Renesas' ordering nomenclature. This package matches the pinout of other H8S/2000-series devices such as R4F20103NFA#G0 and R4F20203NFA#G0, enabling drop-in compatibility in existing designs. Pin assignments are defined in Section 1.4 of the Hardware User's Manual.

Can the R4F20102NFA#G0 operate from a 3.3 V supply?

Yes, the R4F20102NFA#G0 operates across a supply voltage range of 2.7 V to 5.5 V, making it fully compatible with 3.3 V systems. Its I/O pins are 5 V tolerant when configured as inputs, and internal regulators maintain stable core voltage regardless of VCC level. Electrical characteristics for 3.3 V operation - including current consumption and timing parameters - are specified in Table 19.1 of the Hardware User's Manual.

Which serial communication protocols are supported by the R4F20102NFA#G0?

The R4F20102NFA#G0 integrates three asynchronous serial communication interfaces (SCI0–SCI2) supporting UART/RS-232/RS-485 framing, plus two I²C interfaces (IIC0/IIC1) compliant with standard- and fast-mode (100/400 kbps). It does not include CAN, USB, or SPI controllers. All serial modules are register-mapped and share common interrupt vectors managed by the INT controller, as described in Sections 4 and 15 of the Hardware User's Manual.