Renesas M30281FAHP#U5B

Overview

M30281FAHP#U5B from Renesas Electronics is a 16-bit single-chip microcontroller in the M16C/28 Group, designed for embedded control in industrial and consumer systems. It features 256 KB on-chip Flash memory, 16 KB RAM, a 16-MHz max CPU clock, and integrated peripherals including UART, I²C-compatible serial interface, 10-bit ADC, and 16-bit timer/counters. It operates from a 2.7–5.5 V supply and supports low-power WAIT/STOP modes.

For engineers reviewing the M30281FAHP#U5B datasheet, M30281FAHP#U5B pinout, M30281FAHP#U5B application, or M30281FAHP#U5B equivalent, key selection considerations include Flash endurance (10,000 write/erase cycles), operating temperature range (−40 to +85 °C), I/O drive capability (up to 20 mA per port), and compatibility with Renesas' M16C development tools and C compiler suite.

Technical Context

The M30281FAHP#U5B implements the M16C CPU core with 16-bit data bus and 24-bit address space, supporting both 16-bit and 32-bit arithmetic operations. Its memory subsystem includes 256 KB of on-chip Flash with block erase and byte-programmable capability, plus 16 KB of SRAM with wait-state configurable access timing.

Peripheral integration includes three 16-bit multifunction timers (with PWM output and input capture), a 10-bit 16-channel ADC with hardware-triggered conversion, two serial interfaces (UART and CSI), and a watchdog timer with independent clock source. The device uses a PLL-based clock generation circuit supporting main clock (1–10 MHz crystal), sub-clock (32.768 kHz), and on-chip oscillator options.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, plastic body with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M30281FAHP#U5B, R5F102AAASP#V0 offers superior energy efficiency but sacrifices IEBus functionality critical for certain automotive subsystems, while M30282FAXGP#U5 provides scalable memory headroom within the same footprint and toolchain ecosystem.

Availability

M30281FAHP#U5B is available at Aetrix Electronics and suitable for industrial motor control, home appliance MCU, and factory automation I/O modules requiring stable component supply across extended product lifecycles.

Supply support for M30281FAHP#U5B 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, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The M16C/28 Group was engineered for cost-sensitive, real-time embedded control applications demanding high reliability, integrated peripherals, and long-term supply stability in industrial and consumer equipment.

FAQ

What is the maximum operating frequency of the M30281FAHP#U5B?

The M30281FAHP#U5B supports a maximum CPU clock frequency of 16 MHz. This is achieved using the on-chip PLL with an external 1–10 MHz crystal on XT1/XT2. At 16 MHz, instruction execution time is 62.5 ns per cycle for most instructions, enabling deterministic real-time response in motor control and sensor processing applications. The M30281FAHP#U5B maintains this performance across its full −40 to +85 °C operating range.

Does the M30281FAHP#U5B support in-circuit debugging?

Yes, the M30281FAHP#U5B includes a single-wire background debug mode (BDM) interface compatible with Renesas E8/E8a debuggers. This allows full read/write access to memory and registers, hardware breakpoints, and real-time variable monitoring without halting peripheral operation. The M30281FAHP#U5B requires only the BKGD pin and GND for connection-no dedicated JTAG header is needed, simplifying board layout and reducing debug connector cost.

What is the Flash endurance specification for the M30281FAHP#U5B?

The M30281FAHP#U5B guarantees 10,000 write/erase cycles for its 256 KB on-chip Flash memory under standard operating conditions (25 °C, VCC = 3.3 V). Each erase operation targets a 1 KB block, and programming is byte-wise. This endurance supports field firmware updates over the product's service life, especially when wear-leveling techniques are applied in bootloader design. The M30281FAHP#U5B also includes Flash protection bits to prevent accidental overwrite.

Can the M30281FAHP#U5B operate from a 3.3 V supply only?

Yes, the M30281FAHP#U5B operates reliably across 2.7–5.5 V, making 3.3 V a fully supported and commonly used supply voltage. At 3.3 V, it delivers full 16 MHz performance with typical active current of 12 mA and STOP-mode current below 1.5 µA. I/O pins are 5 V tolerant when configured as inputs, allowing safe interfacing with 5 V peripherals without level shifters. The M30281FAHP#U5B's internal voltage regulator ensures stable core voltage regardless of supply variation within spec.

Is the M30281FAHP#U5B pin-compatible with other M16C/28 devices?

Yes, the M30281FAHP#U5B shares the same 100-pin LQFP package and pin assignment with all members of the M16C/28 Group, including M30282FAXGP#U5 and M30283FAXGP#U5. This enables direct substitution where higher Flash (512 KB) or enhanced peripherals (e.g., CAN) are not required. All shared pins-including P0–P9 ports, XT1/XT2, RESET, and CLKOUT-retain identical electrical characteristics and functional mapping in the M30281FAHP#U5B.