Renesas R5F21104FP#U0

Overview

R5F21104FP from Renesas Electronics is a 16-bit Flash-based microcontroller in the R8C/10 Group, built on the R8C/Tiny Series CPU core and packaged in a 32-pin LQFP (PLQP0032GB-A). It delivers 62.5 ns minimum instruction execution time at 16 MHz, integrates 16 KB Flash memory and 1 KB RAM, and supports 10-bit A/D conversion across 8 channels for embedded control applications in household appliances and industrial equipment.

For engineers reviewing the R5F21104FP datasheet, R5F21104FP pinout, R5F21104FP application, or R5F21104FP equivalent, key selection criteria include its -20°C to +85°C operating temperature range, dual UART interfaces (one with clock-synchronous capability), three 8-bit timers plus one 16-bit timer with input capture, and LED drive-capable I/O ports - all critical for cost-sensitive, low-power MCU designs requiring mixed-signal integration.

Technical Context

The R5F21104FP implements the R8C/Tiny Series 16-bit CPU core with 89 basic instructions and a 1-Mbyte address space. Its memory subsystem includes 16 KB on-chip Flash (100 write/erase cycles) and 1 KB SRAM, mapped to fixed regions with a dedicated 256-byte interrupt vector table at 0FFDC₁₆–0FFFF₁₆.

Peripheral integration centers on dual serial interfaces (UART0 with clock-synchronous mode, UART1), an 8-channel 10-bit A/D converter with internal reference support, four external interrupt inputs (INT0–INT3), and five timer modules - including Timer C's 16-bit input capture function - all controlled via dedicated Special Function Registers (SFRs) accessible in the 00000₁₆–002FF₁₆ address range.

Key Specifications

Pinout & Package

Package: 32-pin plastic LQFP (PLQP0032GB-A), 7 mm × 7 mm, 0.8 mm pitch, surface-mount - compatible with standard reflow processes and suitable for compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21104DFP, the R5F21104FP offers identical functionality at lower cost for commercial-temperature applications, while R5F21103FP provides a scalable entry point with reduced memory - enabling tiered product families without redesigning PCB layout or firmware architecture.

Availability

R5F21104FP is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and office equipment motor control requiring stable component supply and long-term production continuity.

Supply support for R5F21104FP 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 solutions for industrial and consumer markets.

The R8C/10 Group targets cost-sensitive embedded control applications demanding integrated analog peripherals, low power consumption, and robust real-time performance - particularly in white goods, building automation, and small industrial equipment.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for the R5F21104FP?

The R5F21104FP achieves a maximum operating frequency of 16 MHz at a supply voltage of 3.0–5.5 V. At 10 MHz, it supports a wider voltage range of 2.7–5.5 V. These specifications are defined in the electrical characteristics section of the R8C/10 Group datasheet (Rev. 1.60), ensuring reliable operation across common industrial and consumer power rails without external regulators.

Does the R5F21104FP support in-circuit debugging, and what pins are required?

Yes, the R5F21104FP supports on-chip debugging via dedicated debug interface pins. Pins P00/AN7/TxD11 and P37/TxD10/RxD1 are reserved for debugger communication and must not be used for application I/O when debugging is enabled. This capability allows real-time firmware validation and hardware-software co-debugging without requiring external JTAG adapters.

How many analog input channels does the R5F21104FP's A/D converter support, and what is its resolution?

The R5F21104FP integrates a single 10-bit successive-approximation A/D converter with eight analog input channels (AN0–AN7), mapped to Port 0 pins P00–P07. It supports internal reference voltage (VREF tied to Vcc) or external reference, delivering 10-bit precision for sensor signal conditioning in applications like temperature monitoring and motor current sensing.

Can the R5F21104FP generate PWM signals, and which peripherals enable this function?

Yes, the R5F21104FP can generate PWM signals using its Timer X, Y, and Z modules - each 8-bit timer includes an 8-bit prescaler and output compare functionality suitable for basic PWM generation. Timer C (16-bit) supports input capture and can be configured for edge-aligned or center-aligned PWM when combined with software-controlled GPIO toggling on associated I/O pins.

What is the Flash memory endurance specification for the R5F21104FP, and how does it impact field firmware updates?

The R5F21104FP's on-chip Flash memory is rated for 100 program/erase cycles. This endurance level supports infrequent field updates - such as calibration data storage or minor feature patches - but is not intended for high-frequency wear-leveling applications like data logging. For robust over-the-air updates, firmware must implement sector management and redundancy to avoid exceeding cycle limits in active code regions.