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Renesas R4F24256NFAU#HZ
- Part No.:
- R4F24256NFAU#HZ
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 120-LQFP
- Datasheet:
-
R4F24256NFAU#HZ.pdf
- Description:
- 16-BIT GENERAL MCU
- Quantity:
- Payment:
- Shipping:
Inventory:2,523
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Product details
Overview
R4F24256NFAU#HZ from Renesas Electronics is a 16-bit H8S/2425 Group microcontroller featuring 256 KB on-chip flash memory, 16 KB RAM, and operation up to 32 MHz. It integrates a 16-bit CPU core, TPU (16-bit timer pulse unit), SCI (serial communication interface), WDT, and CPG with PLL clock generation. Designed for industrial control and embedded instrumentation, it supports real-time motor control and sensor data acquisition in fixed-function systems.
For engineers reviewing the R4F24256NFAU#HZ datasheet, R4F24256NFAU#HZ pinout, R4F24256NFAU#HZ application, or R4F24256NFAU#HZ equivalent, key selection criteria include flash endurance (10,000 write/erase cycles), operating temperature range (−40°C to +85°C), and support for single-cycle instruction execution at 32 MHz - critical for deterministic timing in closed-loop control firmware.
Technical Context
The R4F24256NFAU#HZ implements the H8S/2400 Series CPU architecture with 24-bit address space, advanced mode enabling extended register access, and hardware multiply-accumulate (MAC) support. Its CPG includes PLL-based clock synthesis with selectable input sources (crystal, external clock, or internal RC oscillator) and programmable division ratios for system clock derivation.
Peripheral integration includes dual SCI channels supporting asynchronous full-duplex communication at up to 2 Mbps, a 16-bit TPU with PWM output capability and input capture, and an 8-bit timer (TMR) with interval count and compare match functions. All peripherals are memory-mapped and accessible via dedicated SFRs with configurable interrupt priority levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | H8S/2400 16-bit CPU with 24-bit address bus and MAC unit - enables efficient fixed-point math for motor control algorithms |
| Flash Memory | 256 KB on-chip flash with 10,000 write/erase cycles - sufficient for firmware with field-upgrade capability and parameter storage |
| RAM | 16 KB on-chip RAM - supports real-time stack, ISR context, and buffer-intensive protocols like Modbus RTU |
| Max Operating Frequency | 32 MHz system clock - delivers 32 MIPS throughput for deterministic loop execution in industrial PLC modules |
| Operating Voltage | 3.0 V to 5.5 V supply range - compatible with legacy 5 V logic and modern 3.3 V I/O domains without level shifters |
| Temperature Range | −40°C to +85°C industrial grade - validated for deployment in factory-floor HMIs and motor drive enclosures |
| Package | 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) - standard footprint for high-density industrial PCB layouts |
Pinout & Package
Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, plastic body with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply (main) | Primary 3.0–5.5 V supply for core and I/O; requires local 100 nF decoupling per VCC pin group |
| VSS | Ground reference | Dedicated analog/digital ground return; must be connected to low-impedance PCB plane |
| XTAL/EXTAL | Crystal oscillator input/output | Supports 1–10 MHz crystal; drives internal CPG PLL for stable 32 MHz system clock generation |
| RESET | Active-low reset input | Asynchronous reset assertion clears CPU registers and initializes peripheral SFRs to power-on state |
| PA0–PA7 | Port A general-purpose I/O | Bi-directional with pull-up enable; PA0–PA3 configurable as TPU channel A/B inputs/outputs |
| SCI0_TXD/SCI0_RXD | Serial interface transmit/receive | Full-duplex UART pins for Modbus RTU master/slave communication at up to 2 Mbps baud rate |
Key Features
| Feature | Design Value |
|---|---|
| On-chip debug interface | Single-wire background debugger (BDM) support enables non-intrusive firmware validation without JTAG header |
| Watchdog timer (WDT) | Configurable timeout from 16 ms to 2.1 s with windowed operation - prevents runaway code in safety-critical loops |
| TPU with PWM output | Two independent 16-bit channels with dead-time insertion and complementary output - suitable for 3-phase inverter gate drive |
| Memory protection | Flash lock bits and RAM write-protection registers prevent accidental overwrite during field updates |
| Low-power modes | Four standby modes (software standby, deep software standby, stop, and wait) with wake-up on SCI or external IRQ |
Applications
| Industrial Motor Control | Programmable Logic Controller (PLC) I/O Module |
|---|---|
|
Use Scenario: Closed-loop speed regulation of 3-phase AC induction motors using encoder feedback and space-vector PWM. IC Role / Device Role / Timing Role: Real-time execution of PID algorithm, TPU-driven PWM waveform generation, and SCI-based command interface to HMI. Use Value: Deterministic 32 MHz instruction throughput ensures sub-100 µs control loop latency; integrated TPU eliminates external PWM generator IC. |
Use Scenario: Digital input/output expansion module for DIN-rail mounted PLCs handling 16-channel discrete signal conditioning. IC Role / Device Role / Timing Role: GPIO management, debounce filtering, status reporting via Modbus RTU over SCI, and watchdog supervision. Use Value: 100-pin LQFP provides sufficient I/O for parallel port expansion; 256 KB flash stores multiple firmware variants for modular configuration. |
| Building Automation Sensor Node | Embedded Test Instrumentation |
|
Use Scenario: Multi-sensor data aggregator (temperature, humidity, CO₂) with wired RS-485 backhaul in HVAC control panels. IC Role / Device Role / Timing Role: ADC interface (via external converter), time-stamped event logging to flash, and dual-SCI RS-485 transceiver control. Use Value: −40°C to +85°C rating ensures reliability inside unconditioned mechanical rooms; 16 KB RAM buffers sensor bursts before transmission. |
Use Scenario: Portable handheld tester for verifying relay timing, contact resistance, and isolation integrity in electrical distribution systems. IC Role / Device Role / Timing Role: Precision timestamping of switch closures via TPU input capture, battery-powered operation with low-power modes, and USB-to-SCI bridge. Use Value: Hardware timer capture resolves events with 31.25 ns resolution at 32 MHz; software standby mode extends battery life beyond 12 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R4F24256NFAV#W1 | Same die, 100-pin LQFP but with different marking and tape-and-reel packaging; identical electrical specs and pinout | No functional difference; used in alternate distribution channels with different reel orientation and labeling | Select when sourcing from distributors requiring W1 suffix compliance or specific reel configuration |
| R4F24252NFAU#HZ | Same package and pinout, but with 128 KB flash and 8 KB RAM - reduced memory capacity only | Suitable for simpler control tasks without firmware update capability or large lookup tables | Choose for cost-sensitive designs where 128 KB flash suffices and BOM consolidation is prioritized |
Compared with R4F24256NFAU#HZ, the R4F24256NFAV#W1 offers identical functionality in alternate packaging, while the R4F24252NFAU#HZ trades flash/RAM capacity for lower unit cost - both require no PCB redesign but differ in firmware scalability and field upgrade headroom.
Availability
R4F24256NFAU#HZ is available at Aetrix Electronics and suitable for industrial motor control, PLC I/O modules, and building automation sensor nodes requiring stable component supply across multi-year production cycles.
Supply support for R4F24256NFAU#HZ 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/2425 Group, including R4F24256NFAU#HZ, was designed for deterministic real-time control in cost-sensitive industrial equipment - emphasizing robust peripheral integration, wide voltage tolerance, and long-term supply stability.
FAQ
What is the maximum system clock frequency supported by the R4F24256NFAU#HZ?
The R4F24256NFAU#HZ supports a maximum system clock frequency of 32 MHz, achieved via its on-chip CPG with PLL. This frequency is confirmed in the H8S/2427, H8S/2427R, H8S/2425 Group User's Manual (Rev. 3.00, Sep 2012), Section 1.1.2. At 32 MHz, the R4F24256NFAU#HZ delivers 32 MIPS performance for time-critical control loops without external clock multiplication circuitry.
Does the R4F24256NFAU#HZ include on-chip flash memory, and what is its endurance rating?
Yes, the R4F24256NFAU#HZ integrates 256 KB of on-chip flash memory rated for 10,000 write/erase cycles, as specified in the H8S/2427, H8S/2427R, H8S/2425 Group User's Manual (Rev. 3.00). This endurance supports field firmware updates and parameter storage in industrial applications where long-term reliability is required without external EEPROM.
What communication interfaces are integrated into the R4F24256NFAU#HZ?
The R4F24256NFAU#HZ integrates two Serial Communication Interface (SCI) channels compliant with UART protocol, supporting asynchronous full-duplex communication at baud rates up to 2 Mbps. These SCIs are documented in Section 14 of the H8S/2427, H8S/2427R, H8S/2425 Group User's Manual and are commonly used for Modbus RTU and host PC debugging in R4F24256NFAU#HZ-based designs.
Is the R4F24256NFAU#HZ pin-compatible with other members of the H8S/2425 Group?
Yes, the R4F24256NFAU#HZ shares identical pinout and package (100-pin LQFP) with other H8S/2425 Group variants such as R4F24252NFAU#HZ and R4F24256NFAV#W1. The H8S/2427, H8S/2427R, H8S/2425 Group User's Manual confirms consistent pin assignments across this family, enabling direct substitution where memory requirements align - though firmware must be verified for flash size constraints.
What is the operating temperature range for the R4F24256NFAU#HZ?
The R4F24256NFAU#HZ is rated for industrial operation from −40°C to +85°C, as defined in the "General Precautions" section and electrical characteristics summary of the H8S/2427, H8S/2427R, H8S/2425 Group User's Manual (Rev. 3.00). This range qualifies the R4F24256NFAU#HZ for deployment in factory automation, outdoor metering, and HVAC equipment without derating.
R4F24256NFAU#HZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 120-LQFP
- Series:
- H8® H8S/2400
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- H8S/2600
- Core Size:
- 16-Bit
- Speed:
- 33MHz
- Connectivity:
- EBI/EMI, I2C, IrDA, SCI, SmartCard, SPI, SSU, UART/USART
- Peripherals:
- DMA, POR, PWM, WDT
- Number of I/O:
- 83
- Program Memory Size:
- 384KB (384K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 64K x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- A/D 10x10b SAR; D/A 2x8b
- Oscillator Type:
- External
- Operating Temperature:
- -20°C ~ 75°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R4F24256NFAU#HZ FAQ
1.How can I place an order for R4F24256NFAU#HZ through Aetrix?
Please submit a Request for Quotation (RFQ) for R4F24256NFAU#HZ 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 R4F24256NFAU#HZ reliable?
The price and inventory of R4F24256NFAU#HZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R4F24256NFAU#HZ is usually 5 days.
3.What payment methods are accepted for R4F24256NFAU#HZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R4F24256NFAU#HZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R4F24256NFAU#HZ?
R4F24256NFAU#HZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R4F24256NFAU#HZ 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 R4F24256NFAU#HZ?
For technical support, including R4F24256NFAU#HZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R4F24256NFAU#HZ requirements.
6.How does Aetrix verify that R4F24256NFAU#HZ is sourced from the original manufacturer or authorized distributors?
All R4F24256NFAU#HZ 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 R4F24256NFAU#HZ meets industry standards.
7.What is the process for return or replacement of R4F24256NFAU#HZ?
All R4F24256NFAU#HZ units undergo pre-shipment inspection (PSI). If there is an issue with R4F24256NFAU#HZ, 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 R4F24256NFAU#HZ part is unused and in its original packaging.
Return procedure for R4F24256NFAU#HZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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