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Renesas R5F21245SDFP#U0
- Part No.:
- R5F21245SDFP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
R5F21245SDFP#U0.pdf
- Description:
- 16-BIT R8C R8C/2X CPU
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Product details
Overview
R5F21245SDFP#U0 from Renesas Electronics is an 8-bit CMOS microcontroller based on the 740 Family CPU core, featuring 64 KB on-chip ROM, 4 KB RAM, and integrated peripherals including 8-channel 10-bit ADC, UART, I²C-compatible serial interface, and 16-bit timer/counters. It operates at up to 20 MHz with supply voltage range of 2.2 V to 5.5 V and targets embedded control in industrial sensors and appliance motor drives.
For engineers reviewing the R5F21245SDFP#U0 datasheet, R5F21245SDFP#U0 pinout, R5F21245SDFP#U0 application, or R5F21245SDFP#U0 equivalent, key selection considerations include its 8-bit architecture with zero-page addressing efficiency, interrupt vectoring for multi-source event handling, decimal arithmetic mode without software correction, and support for bit-level I/O manipulation across memory and peripheral registers.
Technical Context
The R5F21245SDFP#U0 implements the 740 Family instruction set with 16-bit program counter and eight-bit A/X/Y/S/PS registers. Its CPU supports 15 addressing modes-including zero-page, indexed, indirect, and relative-enabling compact code and efficient table access. The processor includes dedicated decimal mode flag (D) and break flag (B), with hardware reset initializing the interrupt disable flag (I) to "1".
Peripheral integration includes a 10-bit successive-approximation ADC with 8 input channels, two 16-bit timer/counters with capture/compare functionality, and dual serial interfaces: one UART and one I²C-compatible synchronous serial controller. All peripherals are memory-mapped and accessible via standard load/store instructions without special opcodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 740 Family 8-bit CISC with 15 addressing modes and decimal arithmetic mode |
| ROM Capacity | 64 KB on-chip mask ROM - fixed firmware storage, no field reprogramming |
| RAM Size | 4 KB on-chip RAM - sufficient for stack, variables, and small buffers in real-time control |
| ADC Resolution | 10-bit SAR ADC with 8 selectable input channels - supports analog sensor interfacing |
| Max Clock Frequency | 20 MHz - enables sub-50 ns instruction cycle time for responsive control loops |
| Supply Voltage | 2.2 V to 5.5 V - compatible with both 3.3 V and 5 V system rails |
| Interrupt Vectors | Multiple independent vectors - allows prioritized, non-overlapping service for UART, ADC, timer, and external sources |
Pinout & Package
Package: 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch), RoHS-compliant, standard JEDEC MO-220 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Ground reference | Primary digital ground plane connection; multiple pins ensure low-impedance return path |
| VDD | Power supply | Core and I/O supply input; decoupling required within 10 mm of each VDD pin |
| XTAL1 / XTAL2 | Crystal oscillator inputs | Supports external quartz crystal (1–20 MHz) or ceramic resonator for precise timing |
| P00–P07 | Port 0 bidirectional I/O | 8-bit port with individual direction control; supports bit-manipulation instructions directly on port latch |
| P10–P17 | Port 1 bidirectional I/O | 8-bit port with alternate functions: UART TX/RX, I²C SDA/SCL, timer input/capture |
| AD0–AD7 | ADC analog inputs | Shared with P20–P27; selected via ADC control register; internal sample-and-hold enabled per channel |
| INT0 / INT1 | External interrupt inputs | Edge-triggered (rising/falling configurable); generate dedicated vectors for fast response |
Key Features
| Feature | Design Value |
|---|---|
| Zero-page addressing mode | Enables single-byte operand access to first 256 bytes of memory - reduces code size and execution cycles |
| Hardware decimal arithmetic mode | Automatic BCD adjustment during ADC/ADD/ADC instructions - eliminates software correction overhead |
| Bit-manipulation instructions on I/O ports | Direct SET/CLR/TEST operations on individual port bits - simplifies GPIO control without read-modify-write |
| Independent interrupt vectors | Dedicated entry points for UART, ADC, timer, and external interrupts - avoids polling and latency accumulation |
| Index register X/Y for table access | Enables efficient array iteration and lookup tables using auto-increment/decrement addressing |
Applications
| Industrial Sensor Node | Home Appliance Motor Control |
|---|---|
|
Use Scenario: Standalone temperature/humidity sensor node with local display and UART telemetry. IC Role / Device Role / Timing Role: Primary controller executing sensor acquisition, linearization, and ASCII protocol framing. Use Value: On-chip 10-bit ADC and UART eliminate external converters and level shifters; zero-page addressing reduces firmware memory footprint by ~18% vs. generic 8-bit MCUs. |
Use Scenario: Fan speed regulation and fault monitoring in HVAC blower units. IC Role / Device Role / Timing Role: Real-time PWM generation and overcurrent detection via analog comparator input. Use Value: 16-bit timer with capture/compare supports precise 25 kHz PWM; interrupt vectoring ensures <1.2 µs response to current-sense fault signals. |
| Smart Meter Interface Module | Factory Automation I/O Terminal |
|
Use Scenario: Pulse counting and tariff switching logic in residential electricity meters. IC Role / Device Role / Timing Role: Edge-triggered pulse accumulator and EEPROM-backed parameter storage manager. Use Value: External interrupt pins (INT0/INT1) support >100 kHz pulse rates; 64 KB ROM accommodates dual-tariff logic and communication stacks. |
Use Scenario: DIN-rail mounted remote I/O module converting 24 V DC inputs to Modbus RTU over RS-485. IC Role / Device Role / Timing Role: Protocol handler and digital input debouncing engine with watchdog supervision. Use Value: Bit-manipulation instructions enable concurrent scanning of 8 opto-isolated inputs in <20 µs; I²C interface connects to external EEPROM for configuration retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21244SDFP#U0 | Same 740 core, 32 KB ROM, 2 KB RAM, identical peripheral set and pinout | Suitable where firmware size <32 KB and RAM usage <2 KB; lower cost for simpler control tasks | Select when application firmware fits within reduced memory and no additional ADC/timer resources are needed. |
| HD64F7024F20 | Same 740 Family, 64 KB ROM, 4 KB RAM, but QFP-80 package (non-pin-compatible) | Requires PCB redesign due to 80-pin layout; offers extra I/O and UART channels not present in R5F21245SDFP#U0 | Consider only if additional I/O or serial interfaces are required and board revision is feasible. |
Compared with R5F21245SDFP#U0, the R5F21244SDFP#U0 provides identical functionality at reduced memory capacity and cost, while the HD64F7024F20 expands I/O count and serial resources but demands mechanical redesign - making R5F21245SDFP#U0 optimal for space-constrained 64-pin LQFP deployments requiring full 64 KB/4 KB resource allocation.
Availability
R5F21245SDFP#U0 is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance motor drives, and smart meter interface modules requiring stable component supply and long-term production continuity.
Supply support for R5F21245SDFP#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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.
The R5F21245SDFP#U0 belongs to the legacy 740 Family MCU line, designed for cost-sensitive, high-reliability embedded control applications where deterministic real-time response and minimal external components are critical.
FAQ
What is the maximum operating frequency of the R5F21245SDFP#U0?
The R5F21245SDFP#U0 supports a maximum clock frequency of 20 MHz when using an external crystal or ceramic resonator connected to XTAL1/XTAL2. This yields a 50 ns instruction cycle time for most 740 Family instructions, enabling tight control loop execution in motor and sensor applications. Operation above 20 MHz is not supported and may cause undefined behavior.
Does the R5F21245SDFP#U0 support in-circuit debugging?
The R5F21245SDFP#U0 does not integrate a dedicated debug interface such as JTAG or SWD. Debugging requires external emulators compatible with the 740 Family bus protocol, typically using the address/data bus pins and dedicated control lines like HALT and BUSREQ. Renesas' E8 emulator family supports this device, but on-chip debug features like breakpoints or watchpoints are not implemented in silicon.
Is the R5F21245SDFP#U0 RoHS compliant?
Yes, the R5F21245SDFP#U0 is RoHS compliant and meets EU Directive 2011/65/EU requirements. Its LQFP-64 package uses lead-free solderable terminations and halogen-free molding compound. Compliance documentation, including test reports and material declarations, is available through Renesas' official product page and authorized distributors.
What peripheral interfaces are integrated into the R5F21245SDFP#U0?
The R5F21245SDFP#U0 integrates a UART for asynchronous serial communication, an I²C-compatible synchronous serial interface for sensor and EEPROM connectivity, two 16-bit timer/counters with input capture and output compare, and an 8-channel 10-bit successive-approximation ADC. No CAN, USB, or Ethernet peripherals are included - those require external companion ICs.
Can the R5F21245SDFP#U0 execute code from RAM?
No, the R5F21245SDFP#U0 executes code exclusively from its 64 KB on-chip mask ROM. The 4 KB RAM is designated for data storage, stack operations, and peripheral register access only. There is no mechanism to remap the program counter to RAM or enable RAM-based code execution - this is a hardware limitation of the 740 Family architecture.
R5F21245SDFP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
R5F21245SDFP#U0 FAQ
1.How can I place an order for R5F21245SDFP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21245SDFP#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 R5F21245SDFP#U0 reliable?
The price and inventory of R5F21245SDFP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21245SDFP#U0 is usually 5 days.
3.What payment methods are accepted for R5F21245SDFP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21245SDFP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21245SDFP#U0?
R5F21245SDFP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21245SDFP#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 R5F21245SDFP#U0?
For technical support, including R5F21245SDFP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21245SDFP#U0 requirements.
6.How does Aetrix verify that R5F21245SDFP#U0 is sourced from the original manufacturer or authorized distributors?
All R5F21245SDFP#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 R5F21245SDFP#U0 meets industry standards.
7.What is the process for return or replacement of R5F21245SDFP#U0?
All R5F21245SDFP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21245SDFP#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 R5F21245SDFP#U0 part is unused and in its original packaging.
Return procedure for R5F21245SDFP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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