Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

Renesas R5F21124DFP#U0

Name: R5F21124DFP#U0
Brand: Renesas
SKU: R5F21124DFP#U0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: R5F21124DFP#U0

Manufacturer:: Renesas

Category:: Microcontrollers

Package:: 32-LQFP

Datasheet:: R5F21124DFP#U0.pdf

Description:: IC MCU 16BIT 16KB FLASH 32LQFP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,268

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

R5F21124DFP from Renesas Electronics is a 16-bit R8C/Tiny Series microcontroller in a 32-pin LQFP package, featuring 16 KB flash program ROM, 1 KB RAM, dual 2 KB data flash blocks, 10-bit 8-channel ADC, three 8-bit timers (X/Y/Z), one 16-bit timer C with input capture, UART and clock-synchronous serial interface, and watchdog timer. It operates from −40°C to +85°C and supports embedded control in sensor-based housing equipment and industrial appliances.

For engineers reviewing the R5F21124DFP datasheet, R5F21124DFP pinout, R5F21124DFP application, or R5F21124DFP equivalent, key selection criteria include its −40°C to +85°C operating range (D-version), dual 2 KB data flash for firmware updates, integrated LED drive capability on P10–P17, and UART+clock-sync serial interface for host communication and sensor data aggregation.

Technical Context

The R5F21124DFP 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 allocates 1 MB address space, with fixed interrupt vector table at 0FFDC₁₆–0FFFF₁₆, program ROM starting at 0C000₁₆, and data flash at 02000₁₆–02FFF₁₆.

Peripheral integration includes two independent serial interfaces (UART0 and UART1/clock-sync), an 8-channel 10-bit ADC with internal reference, and four external interrupt inputs (INT0–INT3) plus key-input interrupts (KI0–KI3), all managed under a 7-level priority interrupt controller supporting software, internal, and external sources.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Core	R8C/Tiny Series 16-bit CPU with 89 instructions and register bank switching support
Flash Memory	16 KB program ROM + 2 × 2 KB data flash blocks for field firmware updates and parameter storage
RAM	1 KB on-chip RAM mapped at 00400₁₆–007FF₁₆, used for variables, stack, and subroutine calls
ADC	10-bit resolution, 8 input channels (AN0–AN7), internal VREF option, suitable for analog sensor interfacing
Timers	Three 8-bit timers (X/Y/Z) with 8-bit prescalers; one 16-bit Timer C with input capture for pulse-width measurement
Serial Interfaces	UART0 (asynchronous), UART1/clock-sync serial (programmable as UART or synchronous mode)
Operating Range	−40°C to +85°C ambient temperature, 2.7–5.5 V supply voltage, qualifying for industrial-grade applications

Pinout & Package

Package: PLQP0032GB-A (32-pin plastic LQFP, 7 mm × 7 mm, 0.8 mm pitch).

Pin/Terminal	Circuit Role	Design Meaning
VCC / VSS	Power supply / Ground	VCC (pin 16) accepts 2.7–5.5 V; VSS (pins 1, 15, 32) provides digital ground return path
XIN / XOUT	Main clock oscillator I/O	Accepts ceramic resonator or crystal (1–20 MHz); enables precise timing for UART baud rate generation
RESET	Active-low reset input	Asynchronous reset asserted by external pull-down; internal reset circuitry ensures reliable power-on initialization
P00–P07	8-bit bidirectional port with analog inputs	P00–P07 support AN7–AN0; P00 also functions as TxD11 output - requires disabling during on-chip debug
P10–P17	LED drive-capable I/O port	Each pin drives up to 20 mA sink current; configured via direction registers for direct LED segment control
INT0–INT3 / KI0–KI3	External interrupt / key input inputs	Dedicated edge-sensitive inputs for real-time event detection (e.g., door sensor, button press)
RxD0/TxD0 / RxD1/TxD10/TxD11	UART data I/O	UART0 uses P15/P14; UART1 uses P37/P00/P30 - supports full-duplex communication with hardware flow control

Key Features

Feature	Design Value
Data Flash Endurance	10,000 erase/write cycles per 2 KB block - enables robust over-the-air parameter updates without external EEPROM
Low-Power Modes	Wait mode (35 µA @ 3.0 V) and Stop mode (0.7 µA @ 3.0 V) - extends battery life in sensor nodes and portable devices
On-Chip Oscillator	Internal RC oscillator usable as system clock source - eliminates external crystal for cost-sensitive applications
Oscillation Stop Detection	Dedicated circuit monitors XIN/XOUT activity and triggers interrupt or reset - prevents system hang during clock failure
Debug Support	On-chip debug interface accessible via dedicated pins (P46/P47) - enables in-circuit programming and real-time trace without JTAG adapter

Applications

Smart Home Sensor Hub	Industrial Panel Controller
Use Scenario: Central node aggregating temperature, humidity, and motion data from multiple analog/digital sensors in HVAC or security systems. IC Role / Device Role / Timing Role: Main controller executing sensor polling, ADC conversion, UART-based data forwarding, and local decision logic. Use Value: Integrated 10-bit 8-channel ADC and dual UART reduce BOM count; data flash stores calibration coefficients and network settings across power cycles.	Use Scenario: Front-panel interface for PLC or motor drive units requiring pushbutton input, LED status indication, and serial configuration. IC Role / Device Role / Timing Role: Human-machine interface (HMI) processor managing KI0–KI3 key scan, P10–P17 LED drive, and UART command parsing. Use Value: Direct LED sink capability (20 mA/pin) eliminates external drivers; −40°C to +85°C rating ensures reliability in factory-floor enclosures.
Appliance Motor Control	Energy Monitoring Module
Use Scenario: Embedded controller in washing machine or air conditioner managing motor timing, user interface, and fault detection. IC Role / Device Role / Timing Role: Real-time task scheduler using Timer C input capture for motor phase feedback and INT0–INT3 for emergency stop signals. Use Value: 16-bit Timer C with input capture enables precise RPM measurement; watchdog timer ensures fail-safe shutdown on firmware lockup.	Use Scenario: Sub-metering unit measuring AC line voltage/current via shunt or transformer, computing RMS and energy totals. IC Role / Device Role / Timing Role: Signal acquisition engine performing synchronized 10-bit ADC sampling and UART transmission of computed values. Use Value: Internal VREF and AVCC/AVSS pins provide stable analog reference; data flash retains accumulated kWh counters even after power loss.

Smart Home Sensor Hub

Industrial Panel Controller

Use Scenario: Central node aggregating temperature, humidity, and motion data from multiple analog/digital sensors in HVAC or security systems.

IC Role / Device Role / Timing Role: Main controller executing sensor polling, ADC conversion, UART-based data forwarding, and local decision logic.

Use Value: Integrated 10-bit 8-channel ADC and dual UART reduce BOM count; data flash stores calibration coefficients and network settings across power cycles.

Use Scenario: Front-panel interface for PLC or motor drive units requiring pushbutton input, LED status indication, and serial configuration.

IC Role / Device Role / Timing Role: Human-machine interface (HMI) processor managing KI0–KI3 key scan, P10–P17 LED drive, and UART command parsing.

Use Value: Direct LED sink capability (20 mA/pin) eliminates external drivers; −40°C to +85°C rating ensures reliability in factory-floor enclosures.

Appliance Motor Control

Energy Monitoring Module

Use Scenario: Embedded controller in washing machine or air conditioner managing motor timing, user interface, and fault detection.

IC Role / Device Role / Timing Role: Real-time task scheduler using Timer C input capture for motor phase feedback and INT0–INT3 for emergency stop signals.

Use Value: 16-bit Timer C with input capture enables precise RPM measurement; watchdog timer ensures fail-safe shutdown on firmware lockup.

Use Scenario: Sub-metering unit measuring AC line voltage/current via shunt or transformer, computing RMS and energy totals.

IC Role / Device Role / Timing Role: Signal acquisition engine performing synchronized 10-bit ADC sampling and UART transmission of computed values.

Use Value: Internal VREF and AVCC/AVSS pins provide stable analog reference; data flash retains accumulated kWh counters even after power loss.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
R5F21124FP	Same core, package, and peripherals but rated for −20°C to +85°C (N-version), no D-grade qualification	Suitable for commercial indoor appliances where extended low-temperature operation is not required	Select R5F21124FP only if ambient operating range stays above −20°C; otherwise R5F21124DFP is mandatory
R5F21123DFP	Identical D-version rating and package, but 12 KB program ROM and 768 B RAM instead of 16 KB/1 KB	Appropriate for cost-optimized designs with smaller firmware footprint and reduced variable storage needs	Choose R5F21123DFP when application code size fits within 12 KB and RAM usage remains ≤768 B

Compared with R5F21124FP and R5F21123DFP, the R5F21124DFP uniquely combines industrial temperature range (−40°C to +85°C), maximum on-chip memory (16 KB/1 KB), and dual 2 KB data flash - making it the only choice for field-upgradable, wide-temperature embedded controllers requiring long-term data retention.

Availability

R5F21124DFP is available at Aetrix Electronics and suitable for smart home sensor hubs, industrial panel controllers, and appliance motor control systems requiring stable component supply and long-lifecycle support.

Supply support for R5F21124DFP 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, and power solutions for automotive, industrial, and IoT markets.

The R8C/12 Group, including the R5F21124DFP, was designed for cost-sensitive, low-power embedded control in household appliances, housing equipment, and general industrial systems - emphasizing integration, reliability, and ease of debug.

FAQ

What is the operating temperature range of the R5F21124DFP?

The R5F21124DFP is rated for −40°C to +85°C ambient temperature, designated by the "D" suffix in its part number. This industrial-grade specification ensures reliable operation in harsh environments such as factory automation panels, outdoor sensor enclosures, and HVAC control units where thermal extremes occur. The R5F21124DFP maintains full functionality across this range without derating.

Does the R5F21124DFP support in-system programming via UART?

Yes, the R5F21124DFP supports in-system programming (ISP) through its UART0 interface using Renesas' standard flash programming protocol. This allows firmware updates in the field without removing the device from the PCB. The R5F21124DFP's dual 2 KB data flash blocks further enable safe background updates while maintaining active program execution in the main ROM area.

How many analog input channels does the R5F21124DFP ADC support?

The R5F21124DFP integrates a single 10-bit successive-approximation ADC with eight analog input channels (AN0–AN7), mapped to port pins P00–P07. Each channel supports programmable sampling time and conversion trigger sources, including software, timer, or external events. The R5F21124DFP also provides internal VREF routing and separate AVCC/AVSS pins for noise-isolated analog measurements.

Can the R5F21124DFP drive LEDs directly without external transistors?

Yes, the R5F21124DFP's P10–P17 port pins are specifically designed as LED drive ports capable of sinking up to 20 mA per pin. This allows direct connection of common-anode LEDs with appropriate current-limiting resistors. The R5F21124DFP's port direction registers and output latch control enable efficient multiplexed display driving - eliminating discrete driver ICs in HMI applications.

What debug interface does the R5F21124DFP provide?

The R5F21124DFP features an on-chip debug interface accessible via dedicated pins P46 (debug clock) and P47 (debug data), supporting full in-circuit debugging, breakpoint setting, and real-time variable monitoring without requiring external JTAG adapters. This debug capability is enabled by default and requires no additional firmware overhead - simplifying development and validation of the R5F21124DFP-based systems.

R5F21124DFP#U0 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Package/Case:: 32-LQFP

Series:: R8C/1x/12

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Core Processor:: R8C

Core Size:: 16-Bit

Speed:: 16MHz

Connectivity:: SIO, UART/USART

Peripherals:: LED, WDT

Number of I/O:: 22

Program Memory Size:: 16KB (16K x 8)

Program Memory Type:: FLASH

EEPROM Size:: 4K x 8

RAM Size:: 1K x 8

Voltage - Supply (Vcc/Vdd):: 2.7V ~ 5.5V

Data Converters:: A/D 8x10b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

R5F21124DFP#U0 FAQ

1.How can I place an order for R5F21124DFP#U0 through Aetrix?

Please submit a Request for Quotation (RFQ) for R5F21124DFP#U0 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for R5F21124DFP#U0 reliable?

The price and inventory of R5F21124DFP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21124DFP#U0 is usually 5 days.

3.What payment methods are accepted for R5F21124DFP#U0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21124DFP#U0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for R5F21124DFP#U0?

R5F21124DFP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your R5F21124DFP#U0 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for R5F21124DFP#U0?

For technical support, including R5F21124DFP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21124DFP#U0 requirements.

6.How does Aetrix verify that R5F21124DFP#U0 is sourced from the original manufacturer or authorized distributors?

All R5F21124DFP#U0 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that R5F21124DFP#U0 meets industry standards.

7.What is the process for return or replacement of R5F21124DFP#U0?

All R5F21124DFP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21124DFP#U0, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The R5F21124DFP#U0 part is unused and in its original packaging.

Return procedure for R5F21124DFP#U0:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…