Renesas R4F20202NFD#U0

Overview

R4F20202NFD#U0 from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/Tiny series, designed for embedded control in resource-constrained industrial and consumer systems. It integrates 64 KB on-chip flash memory, 4 KB RAM, a 24 MHz max CPU clock, 32-pin LQFP package, and peripheral sets including UART, I²C, 16-bit timers, and 10-bit ADC. It serves as a main system controller in motor-driven appliances and sensor-based monitoring units.

For engineers reviewing the R4F20202NFD#U0 datasheet, R4F20202NFD#U0 pinout, R4F20202NFD#U0 application, or R4F20202NFD#U0 equivalent, key selection criteria include its 64 KB flash/4 KB RAM balance, 24 MHz operation at 2.7–5.5 V supply, LQFP-32 footprint compatibility, and support for real-time interrupt handling with 32-vector priority-controlled IRQs.

Technical Context

The R4F20202NFD#U0 implements the H8S/2000 CPU core with 16-bit data bus and 24-bit address space, supporting both advanced and standard operating modes. It features a programmable clock pulse generator (CPG) with internal oscillator and external crystal options, enabling flexible clock source selection between 1 MHz and 24 MHz.

Peripheral integration includes three serial interfaces (SCI0–SCI2), two 16-bit timer/counters with compare-match and input-capture capability, a 10-bit 8-channel ADC, and low-voltage detection (LVD) circuitry. All peripherals are memory-mapped and accessible via dedicated SFRs with configurable interrupt vectors.

Key Specifications

Pinout & Package

Package: 32-pin LQFP (7 mm × 7 mm, 0.8 mm pitch), thermally enhanced with exposed pad (EPAD) connected to VSS for improved heat dissipation in continuous operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F20202NFD#U0, R4F20203NFD#U0 offers scalable memory for evolving feature sets, while R4F20102NFD#U0 trades capacity for BOM cost reduction - neither is pin-compatible without verifying peripheral register mapping alignment in target firmware.

Availability

R4F20202NFD#U0 is available at Aetrix Electronics and suitable for industrial motor control, battery-powered sensor nodes, POS peripheral interfaces, and smart lighting modules requiring stable component supply across multi-year production cycles.

Supply support for R4F20202NFD#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 specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The H8S/Tiny series - including R4F20202NFD#U0 - was engineered for cost-effective, low-power embedded control in space-constrained applications where deterministic real-time response and long-term supply stability are critical.

FAQ

What is the maximum operating frequency of the R4F20202NFD#U0?

The R4F20202NFD#U0 supports a maximum CPU clock frequency of 24 MHz, achievable using either the internal high-speed oscillator or an external crystal up to 20 MHz with PLL multiplication. At this speed, it delivers 2.4 MIPS performance while maintaining full peripheral functionality and meeting timing specifications across the 2.7–5.5 V supply range. The R4F20202NFD#U0's CPG register settings must be configured to select the appropriate clock source and prescaler values to reach 24 MHz reliably.

Does the R4F20202NFD#U0 include on-chip debug capability?

Yes, the R4F20202NFD#U0 integrates a single-wire background debugger (BDM) interface compliant with Renesas' standard debug protocol. This allows non-intrusive program download, breakpoint setting, register inspection, and real-time variable monitoring without halting CPU execution. The debug interface uses the RES pin in multiplexed mode and requires no additional pins beyond the standard reset and power connections. Full debug access to the R4F20202NFD#U0 is supported by Renesas E1/E20 emulators and compatible third-party tools.

What are the power supply requirements for the R4F20202NFD#U0?

The R4F20202NFD#U0 operates from a single supply voltage ranging from 2.7 V to 5.5 V, making it compatible with both 3.3 V and 5 V system rails. It features separate VCC and VSS pins for core and I/O domains, and its exposed thermal pad must be connected to PCB ground for thermal stability. Under active 24 MHz operation, typical current consumption is 12 mA; in HALT mode, it drops to 1.2 μA. The R4F20202NFD#U0 also includes an internal low-voltage detection (LVD) circuit configurable to generate interrupts or resets at 2.5 V, 2.7 V, 3.0 V, or 4.0 V thresholds.

How many serial communication interfaces does the R4F20202NFD#U0 support?

The R4F20202NFD#U0 integrates three independent serial communication interfaces: SCI0, SCI1, and SCI2. Each supports asynchronous UART operation with programmable baud rates, parity, stop bits, and framing - plus synchronous operation in master/slave modes. SCI0 and SCI1 share pins with Port A, while SCI2 uses dedicated pins. All three SCIs support automatic baud-rate detection, break signal generation, and error flagging (framing, overrun, parity). This triple-SCI capability makes the R4F20202NFD#U0 especially suitable for multi-peripheral bridging applications such as POS terminal add-ons or industrial gateway modules.

Is the R4F20202NFD#U0 pin-compatible with other H8S/Tiny family members?

The R4F20202NFD#U0 shares the same 32-pin LQFP package and core pin assignment with several H8S/Tiny variants including R4F20102NFD#U0 and R4F20203NFD#U0, but functional pin compatibility depends on peripheral enablement and register configuration. For example, ADC input channels and timer I/O functions are mapped to specific Port A pins and may differ in availability or default state across variants. While PCB layout can often be reused, firmware must be validated for each part due to differences in memory size, peripheral count, and reset vector behavior. Direct substitution of R4F20202NFD#U0 into designs originally targeting other H8S/Tiny parts requires verification of all used SFRs and interrupt vectors.