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Renesas R5F10266ASM#55
- Part No.:
- R5F10266ASM#55
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
R5F10266ASM#55.pdf
- Description:
- IC MCU 16BIT 2KB FLASH 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
R5F10266ASM#55 from Renesas Electronics is a 20-pin RL78/G12 16-bit microcontroller with 2 KB code flash, 2 KB data flash, and 256 B RAM, operating at 1.8–5.5 V and delivering 31 DMIPS at 24 MHz. It integrates an ultra-low-power RL78 CPU core (63 μA/MHz), 10-bit A/D converter (11 channels), UART/CSI/I²C serial interfaces, and on-chip debug support - deployed in battery-powered sensor nodes and industrial control panels.
For engineers reviewing the R5F10266ASM#55 datasheet, R5F10266ASM#55 pinout, R5F10266ASM#55 application, or R5F10266ASM#55 equivalent, this page delivers verified technical context, package mapping, real-world use scenarios, and validated alternative options for low-voltage embedded designs requiring integrated data flash and robust interrupt handling.
Technical Context
The R5F10266ASM#55 implements the RL78 CISC CPU core with 3-stage pipeline, supporting instruction execution times from 0.04167 μs (@24 MHz high-speed on-chip oscillator) to 1 μs (@1 MHz). Its memory subsystem includes 2 KB code flash (1 KB block size), 2 KB data flash with background operation (BGO), and 256 B RAM - constrained by fixed 256-byte RAM capacity limiting stack depth for self-programming library use.
Peripheral integration includes 4-channel 16-bit timer (TAU0), 1-channel watchdog timer, 12-bit interval timer, 11-channel 10-bit A/D converter with internal 1.45 V reference and temperature sensor, and dual serial interfaces: 1 UART channel + 2 CSI (SPI-like) channels + 2 simplified I²C channels - all enabled only in HS (high-speed main) mode per datasheet Note 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | RL78 16-bit CISC with 3-stage pipeline; enables deterministic timing-critical firmware execution in resource-constrained systems. |
| Operating Voltage | 1.8 V to 5.5 V; supports direct interface with 1.8 V, 2.5 V, and 3.3 V peripherals without level-shifting. |
| Code Flash / Data Flash | 2 KB / 2 KB; data flash supports background operation (BGO) for concurrent program execution during rewrites. |
| RAM Size | 256 B; fixed capacity confirmed for R5F10266; insufficient for full data flash library stack usage per datasheet Note. |
| A/D Converter | 10-bit resolution, 11 input channels, internal 1.45 V reference, and integrated temperature sensor - suitable for analog monitoring in HVAC and power metering. |
| Serial Interfaces | 1 UART + 2 CSI (SPI-compatible) + 2 simplified I²C channels; enables simultaneous communication with sensors, displays, and EEPROMs. |
| Power Consumption | 63 μA/MHz active current; HALT/STOP/SNOOZE modes reduce system-level energy use in portable equipment. |
Pinout & Package
Package: 20-pin plastic TSSOP (4.4 × 6.5 mm, 0.65-mm pitch), RoHS-compliant, JEDEC MS-013AC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P10/ANI16/PCLBUZ0/SCK00/SCL00 | Port 1 bit 0 / Analog Input 16 / Programmable Clock/Buzzer Output / SPI Clock / I²C Clock | Multi-function pin supporting clock generation, synchronous serial communication, and analog sensing - configurable via PIOR register. |
| P11/ANI17/SI00/RxD0/SDA00/TOOLRxD | Port 1 bit 1 / Analog Input 17 / SPI Input / UART Receive / I²C Data / Debug Receive | Shared serial receive path for UART, I²C, and SPI; TOOLRxD enables in-circuit debugging without external hardware. |
| P12/ANI18/SO00/TxD0/TOOLTxD | Port 1 bit 2 / Analog Input 18 / SPI Output / UART Transmit / I²C Data / Debug Transmit | Unified transmit line for multiple protocols; TOOLTxD allows firmware updates and trace output during development. |
| P13/ANI19/TI00/TO00/INTP2 | Port 1 bit 3 / Analog Input 19 / Timer Input 0 / Timer Output 0 / Interrupt Pin 2 | Hardware timer capture/compare capability with interrupt support - used for pulse-width measurement or motor control timing. |
| P14/ANI20/TI01/TO01/INTP3 | Port 1 bit 4 / Analog Input 20 / Timer Input 1 / Timer Output 1 / Interrupt Pin 3 | Dual timer I/O with interrupt routing enables independent edge-triggered event handling for encoder or sensor inputs. |
| P20/ANI0/AVREFP | Port 2 bit 0 / Analog Input 0 / Positive Analog Reference | Primary analog reference voltage source; must be decoupled with 0.1 µF capacitor for stable A/D conversion accuracy. |
| P21/ANI1/AVREFM | Port 2 bit 1 / Analog Input 1 / Negative Analog Reference | Differential reference pair with P20; enables ratiometric measurements and noise rejection in precision analog front-ends. |
| P22/ANI2 | Port 2 bit 2 / Analog Input 2 | Dedicated analog input with internal sample-and-hold; supports single-ended or differential acquisition across 11 channels. |
| P23/ANI3 | Port 2 bit 3 / Analog Input 3 | Additional analog input; shares same reference structure as P20–P22 - critical for multi-sensor signal conditioning. |
| P40/KR0/TOOL0 | Port 4 bit 0 / Key Return 0 / Debug Interface I/O | Configurable as key scan input or debug communication line; eliminates need for dedicated JTAG/SWD pins. |
| P41/ANI22/SO01/SDA01/TI02/TO02/INTP1 | Port 4 bit 1 / Analog Input 22 / SPI Output / I²C Data / Timer I/O / Interrupt Pin 1 | High-density multiplexing enables compact PCB layout; INTP1 provides fast wake-up from STOP mode. |
| P42/ANI21/SCK01/SCL01/TI03/TO03 | Port 4 bit 2 / Analog Input 21 / SPI Clock / I²C Clock / Timer I/O | Second SPI/I²C interface clock line; TI03/TO03 supports PWM generation for LED dimming or fan speed control. |
| P60/KR4/SCLA0/(TxD0) | Port 6 bit 0 / Key Return 4 / I²C Clock / UART Transmit (remapped) | N-ch open-drain I/O with 6 V tolerance; supports hot-plug I²C bus and level-shifted UART output. |
| P61/KR5/SDAA0/(RxD0) | Port 6 bit 1 / Key Return 5 / I²C Data / UART Receive (remapped) | Complementary I²C data line; 6 V-tolerant design ensures interoperability with 5 V I²C peripherals. |
| P121/KR3/X1/(TI03)/(INTP3) | Port 12 bit 1 / Key Return 3 / Crystal Oscillator Input / Timer Input / Interrupt | Primary crystal oscillator input; TI03 remapping enables external clock monitoring or frequency measurement. |
| P122/KR2/X2/EXCLK/(TI02)/(INTP2) | Port 12 bit 2 / Key Return 2 / Crystal Oscillator Output / External Clock Input / Timer Input / Interrupt | Crystal load capacitance tuning point; EXCLK option allows precise external clock synchronization. |
| P125/KR1/SI01/RESET | Port 12 bit 5 / Key Return 1 / SPI Input / Reset Input | Active-low reset pin with internal pull-up; SI01 remapping enables second SPI interface without additional pins. |
| VDD | Power Supply | Single 1.8–5.5 V supply rail; requires local 100 nF ceramic decoupling adjacent to pin for noise immunity. |
| VSS | Ground | Reference ground for analog and digital domains; must be connected to low-impedance PCB plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low-Power Operation | 63 μA/MHz active current with HALT/STOP/SNOOZE modes - extends battery life in wireless sensor nodes beyond 5 years. |
| Integrated Data Flash | 2 KB data flash with 1,000,000 rewrite cycles and background operation - enables field-upgradable configuration storage without halting MCU operation. |
| On-Chip Debug Support | Fully integrated on-chip debug circuit eliminates need for external debug probes - reduces BOM cost and board space in production units. |
| Multi-Protocol Serial Interface | 1 UART + 2 CSI + 2 simplified I²C channels on shared pins - simplifies connectivity to diverse peripherals using single-port GPIO resources. |
| Analog Subsystem | 11-channel 10-bit A/D with internal 1.45 V reference and temperature sensor - eliminates external references for environmental monitoring applications. |
| Security Functions | CRC calculation unit and RAM/SFR guard logic - prevents unauthorized firmware modification and runtime memory corruption in safety-critical systems. |
Applications
| Smart Home Sensor Node | Industrial Motor Control Panel |
|---|---|
Use Scenario: Battery-powered temperature/humidity/light sensor transmitting data via UART to gateway every 30 seconds. IC Role / Device Role / Timing Role: Main system controller executing sensor polling, A/D conversion, and low-power UART transmission scheduling. Use Value: 63 μA/MHz active current and STOP-mode wake-up via INTP1 enable >5-year battery life; integrated 1.45 V reference ensures ±1.5% A/D accuracy across 1.8–5.5 V supply range. |
Use Scenario: Compact panel-mounted controller managing 3-phase motor start/stop, fault detection, and status LED feedback. IC Role / Device Role / Timing Role: Real-time motor sequencing engine using TO00/TO01 PWM outputs and TI00/TI01 edge capture for encoder feedback. Use Value: 4-channel 16-bit timer with 3 PWM outputs supports precise motor phase timing; N-ch open-drain I/O (P60/P61) interfaces directly with 5 V optocouplers. |
| Portable Medical Monitor | Energy Meter Front-End |
Use Scenario: Handheld pulse oximeter acquiring analog photodiode signals and driving OLED display via CSI interface. IC Role / Device Role / Timing Role: Signal acquisition processor performing synchronized 10-bit A/D sampling and SPI-driven display refresh. Use Value: 11-channel A/D with internal temperature sensor enables ambient compensation; dual CSI channels allow simultaneous sensor readout and display update without CPU intervention. |
Use Scenario: DIN-rail mounted electricity meter measuring voltage/current waveforms and storing tariff data in nonvolatile memory. IC Role / Device Role / Timing Role: Data logging controller writing tariff schedules and consumption history to 2 KB data flash with background operation. Use Value: BGO-enabled data flash permits continuous metering during firmware updates; 12-bit interval timer provides accurate time-of-use billing intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F10267ASM#55 | 4 KB code flash, 512 B RAM, same 20-pin TSSOP package and peripheral set. | Supports larger firmware images and deeper stack usage for complex protocol stacks (e.g., Modbus RTU over UART). | Select when firmware size exceeds 2 KB or data flash library usage requires >256 B RAM. |
| R5F10268ASM#55 | 8 KB code flash, 768 B RAM, identical pinout and peripheral configuration. | Enables integration of bootloader, secure boot, and encrypted communication layers without external memory. | Choose for designs requiring field firmware updates, cryptographic operations, or multi-tasking RTOS environments. |
Compared with R5F10266ASM#55, R5F10267ASM#55 offers double flash and double RAM while maintaining identical low-power behavior and pin compatibility, whereas R5F10268ASM#55 adds 4× flash capacity and 3× RAM for advanced firmware features - both retain the same 2 KB data flash, 11-channel A/D, and serial interface count.
Availability
R5F10266ASM#55 is available at Aetrix Electronics and suitable for smart home sensor nodes, industrial motor control panels, and portable medical monitors requiring stable component supply and long-term lifecycle support.
Supply support for R5F10266ASM#55 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 RL78/G12 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated embedded systems requiring integrated analog peripherals and secure firmware storage.
FAQ
What is the maximum operating frequency and corresponding DMIPS rating for the R5F10266ASM#55?
The R5F10266ASM#55 achieves a maximum operating frequency of 24 MHz using its high-speed on-chip oscillator, delivering 31 DMIPS performance. This benchmark is measured under HS (high-speed main) mode with VDD = 2.7–5.5 V and reflects real-world integer instruction throughput for embedded control tasks.
Does the R5F10266ASM#55 support self-programming of its code flash memory?
Yes, the R5F10266ASM#55 supports self-programming of code flash memory using the RL78 Family Flash Self Programming Library Type01. However, due to its fixed 256 B RAM capacity, stack space may be insufficient for full library execution - users must verify available RAM against library requirements per the User's Manual.
Can the R5F10266ASM#55 operate reliably at 1.8 V supply voltage?
Yes, the R5F10266ASM#55 is fully specified for operation from 1.8 V to 5.5 V. At 1.8 V, it supports LS (low-speed main) mode up to 8 MHz and maintains full functionality of its 10-bit A/D converter, UART, and timers - enabling direct integration with 1.8 V logic families.
What serial communication interfaces are available on the R5F10266ASM#55?
The R5F10266ASM#55 provides one UART channel, two CSI (SPI-compatible) channels, and two simplified I²C channels - all implemented on shared port pins and configurable via the Peripheral I/O Redirection Register (PIOR). These interfaces operate exclusively in HS mode per datasheet Note 2.
Is data flash memory available on the R5F10266ASM#55, and what are its key characteristics?
Yes, the R5F10266ASM#55 includes 2 KB of data flash memory with 1,000,000 write/erase cycles (typical), background operation (BGO) support, and rewrite capability across the full 1.8–5.5 V VDD range - enabling reliable nonvolatile parameter storage without interrupting application execution.
R5F10266ASM#55 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Series:
- RL78/G12
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- RL78
- Core Size:
- 16-Bit
- Speed:
- 24MHz
- Connectivity:
- CSI, I2C, UART/USART
- Peripherals:
- DMA, LVD, POR, PWM, WDT
- Number of I/O:
- 14
- Program Memory Size:
- 2KB (2K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 5.5V
- Data Converters:
- A/D 11x8/10b
- Oscillator Type:
- External, Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F10266ASM#55 FAQ
1.How can I place an order for R5F10266ASM#55 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F10266ASM#55 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 R5F10266ASM#55 reliable?
The price and inventory of R5F10266ASM#55 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F10266ASM#55 is usually 5 days.
3.What payment methods are accepted for R5F10266ASM#55?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F10266ASM#55 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F10266ASM#55?
R5F10266ASM#55 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F10266ASM#55 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 R5F10266ASM#55?
For technical support, including R5F10266ASM#55 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F10266ASM#55 requirements.
6.How does Aetrix verify that R5F10266ASM#55 is sourced from the original manufacturer or authorized distributors?
All R5F10266ASM#55 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 R5F10266ASM#55 meets industry standards.
7.What is the process for return or replacement of R5F10266ASM#55?
All R5F10266ASM#55 units undergo pre-shipment inspection (PSI). If there is an issue with R5F10266ASM#55, 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 R5F10266ASM#55 part is unused and in its original packaging.
Return procedure for R5F10266ASM#55:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F10266ASM#55 Tags
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