Renesas R5F21104DFP#U0

Overview

R5F21104DFP from Renesas Electronics is a 16-bit Flash-based microcontroller in the R8C/10 Group, designed for embedded control in cost-sensitive industrial and consumer systems. It features 16 KB on-chip Flash memory, 1 KB RAM, 10-bit 8-channel ADC, three 8-bit timers (X/Y/Z), one 16-bit Timer C with input capture, dual UART interfaces (one clock-synchronous), and operates from –40°C to +85°C. It targets sensor interface, appliance motor control, and housing equipment monitoring.

For engineers reviewing the R5F21104DFP datasheet, R5F21104DFP pinout, R5F21104DFP application, or R5F21104DFP equivalent, key selection criteria include its D-grade temperature range (–40°C to +85°C), LQFP-32 package with LED drive capability on P10–P17, 2.7–5.5 V supply flexibility, and integrated oscillation stop detection for system reliability in unattended environments.

Technical Context

The R5F21104DFP implements the R8C/Tiny Series CPU core with 89 basic instructions and executes at 62.5 ns minimum instruction time (16 MHz XIN, 3.0–5.5 V). Its memory map provides 1 Mbyte address space, with fixed interrupt vector table at 0FFDC₁₆–0FFFF₁₆, Flash allocated from 0C000₁₆, and RAM from 00400₁₆.

Peripheral integration includes two independent UART channels (UART0 supports clock-synchronous mode; UART1 is standard UART), an 8-channel 10-bit A/D converter with internal reference voltage support (VREF tied to VCC), and four external interrupt inputs (INT0–INT3) plus key-input interrupts (KI0–KI3) for low-power wake-up.

Key Specifications

Pinout & Package

Package: PLQP0032GB-A (32-pin plastic LQFP, 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 R5F21104DFP, R5F21104FP offers identical functionality at lower cost for benign environments, while R5F21103DFP reduces memory capacity but maintains full compatibility for scaled-down implementations - both preserve the same LQFP-32 footprint and interrupt architecture.

Availability

R5F21104DFP is available at Aetrix Electronics and suitable for industrial panel meters, housing security hubs, and home appliance motor control systems requiring stable component supply across multi-year production cycles.

Supply support for R5F21104DFP 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.

The R8C/10 Group targets cost-optimized, low-power embedded control in appliances, office equipment, and industrial sensors - emphasizing integration, temperature robustness, and toolchain maturity for rapid development.

FAQ

What is the maximum operating frequency supported by the R5F21104DFP?

The R5F21104DFP supports a maximum main clock frequency of 16 MHz when powered at 3.0–5.5 V, delivering a minimum instruction execution time of 62.5 ns. At 10 MHz (2.7–5.5 V), it achieves 100 ns per instruction. The on-chip oscillator and external crystal/resonator options provide flexible clock sourcing without requiring external PLL circuitry. This makes the R5F21104DFP suitable for deterministic real-time control in appliance and industrial applications where timing predictability is essential.

Does the R5F21104DFP support in-circuit debugging?

Yes, the R5F21104DFP supports on-chip debugging via dedicated pins (P00/AN7/TxD11 and P37/TxD10/RxD1), though these pins must be reserved and not used for application I/O during debug sessions. Renesas' E8 emulator and associated CS+ IDE provide full visibility into registers, memory, and peripheral states. Debugging does not require external JTAG adapter hardware - the MCU integrates the necessary debug logic internally, simplifying test setup for production validation and field firmware updates.

How many analog input channels does the R5F21104DFP ADC support, and what is its resolution?

The R5F21104DFP integrates a single 10-bit successive-approximation A/D converter with eight input channels (AN0–AN7), mapped directly to port pins P00–P07. It supports internal reference voltage (VREF tied to VCC) or external reference, and conversion time is programmable via prescaler settings. This resolution enables accurate measurement of sensor outputs such as thermistors (±1°C), potentiometers (0.1% linearity), and current-sense amplifiers in motor control feedback paths - all without external ADC components.

Can the R5F21104DFP operate from a 3.3 V supply, and what are the implications for I/O voltage levels?

Yes, the R5F21104DFP operates reliably from 2.7 V to 5.5 V, including standard 3.3 V rails. All digital I/O pins are CMOS-compatible with VCC-referenced thresholds, meaning at 3.3 V supply, VIH ≈ 2.0 V and VIL ≈ 1.3 V - fully interoperable with 3.3 V logic families (e.g., SPI peripherals, GPIO expanders). No level-shifting is required for interfacing with common 3.3 V sensors or communication ICs, simplifying design and reducing bill-of-materials cost in mixed-voltage systems.

What packaging and RoHS compliance status does the R5F21104DFP have?

The R5F21104DFP is supplied in a 32-pin plastic LQFP package (PLQP0032GB-A, 7 mm × 7 mm, 0.8 mm pitch) and is RoHS-compliant per EU Directive 2011/65/EU. Renesas confirms lead-free terminations and halogen-free molding compound. The device meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3), requiring bake conditioning only if exposed to ambient >30°C/60% RH for >168 hours prior to reflow - supporting standard SMT assembly processes without special handling.