Renesas M30281FAHP#U3B

Overview

M30281FAHP#U3B from Renesas Electronics is a 16-bit single-chip microcontroller in the M16C/28 Group, designed for embedded control applications requiring integrated peripherals, low-power operation, and deterministic real-time response. It features 256 KB on-chip Flash memory, 16 KB RAM, a 16-bit CPU core operating at up to 20 MHz, and supports multiple clock sources including main crystal (1–10 MHz), sub-clock (32.768 kHz), and on-chip oscillator. It is used in industrial motor control systems where precise PWM timing and interrupt latency under 1.5 µs are critical.

For engineers reviewing the M30281FAHP#U3B datasheet, M30281FAHP#U3B pinout, M30281FAHP#U3B application, or M30281FAHP#U3B equivalent, key selection criteria include its 100-pin LQFP package, dual UART + I²C + SPI interfaces, 12-bit ADC with 16 channels, 32-bit timer/counter capability, and support for WAIT/STOP low-power modes with wake-up via external interrupt or RTC alarm.

Technical Context

The M30281FAHP#U3B implements the M16C CPU architecture with 16-bit data bus and 24-bit address space, supporting both CISC instruction set and bit-manipulation instructions for efficient peripheral register control. Its clock generation circuit integrates PLL, selectable prescalers, and oscillation stop detection with automatic re-oscillation recovery - enabling robust timing resilience in variable-temperature environments.

Interrupt handling uses a 7-level priority vector table with dedicated hardware for fast context save/restore; peripheral functions include three 16-bit timer/counters (one with 32-bit cascade mode), four-channel PWM output with dead-time insertion, and a 12-bit successive-approximation ADC with sample-and-hold and scan mode - all directly memory-mapped and controllable via SFRs without software overhead.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, standard JEDEC MO-137AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F102AAASP#V0 and MB9BF516RPMC-G-SNE2, the M30281FAHP#U3B delivers optimal balance of mature 16-bit determinism, IEBus integration, and pin-compatible upgrade path within legacy M16C designs - especially where real-time PWM precision and minimal software migration effort are critical.

Availability

M30281FAHP#U3B is available at Aetrix Electronics and suitable for industrial motor control, building automation panels, factory floor HMI terminals, and medical diagnostic subsystems requiring stable component supply and long-term lifecycle assurance.

Supply support for M30281FAHP#U3B 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 automotive, industrial, and IoT markets.

The M16C/28 Group, including the M30281FAHP#U3B, was engineered for deterministic real-time embedded control in resource-constrained industrial equipment - emphasizing low-latency interrupt response, integrated analog peripherals, and robust clock supervision for mission-critical operation.

FAQ

What is the maximum operating frequency of the M30281FAHP#U3B?

The M30281FAHP#U3B supports a maximum CPU clock frequency of 20 MHz, achieved using the on-chip PLL with multiplication factors of ×2 to ×4 applied to a 1–10 MHz main crystal input. This frequency is sustained across the full industrial temperature range (−40°C to +85°C) when supplied with 4.5–5.5 V, and is verified in the Renesas Hardware Manual Rev.2.00 (2007).

Does the M30281FAHP#U3B support in-system programming (ISP)?

Yes, the M30281FAHP#U3B supports in-system programming via its on-chip debug (OCD) interface using the Renesas E8a or E1 emulators. The 256 KB Flash memory can be reprogrammed while soldered on the target board, with sector erase granularity and checksum verification - enabling field firmware updates without removing the M30281FAHP#U3B from the PCB.

What low-power modes does the M30281FAHP#U3B offer, and what is the lowest current draw?

The M30281FAHP#U3B provides WAIT mode (120 µA typical at 5 V, CPU halted) and STOP mode (0.7 µA typical at 5 V, all clocks stopped except sub-clock). In STOP mode, it retains RAM contents and wakes within 10 µs via 19 selectable sources including external interrupt, RTC alarm, or ADC conversion completion - making it suitable for battery-powered monitoring applications.

Is the M30281FAHP#U3B pin-compatible with other M16C/28 family members?

Yes, the M30281FAHP#U3B shares the same 100-pin LQFP package and pin assignment with other M16C/28 Group devices such as M30280FXXX#U3B variants. Pin compatibility extends to power, clock, reset, and primary peripheral signals (UART, I²C, SPI, ADC, PWM), allowing drop-in replacement within the same family - provided Flash size, RAM, and optional features (e.g., IEBus) match design requirements.

What development tools are officially supported for the M30281FAHP#U3B?

Renesas officially supports the M30281FAHP#U3B with the HEW (High-performance Embedded Workshop) IDE v4.0+, the CC-RL C compiler, and the E8a or E1 on-chip debug emulators. Application notes AN1901 and AN1902 provide validated startup code, peripheral driver examples, and IEBus protocol stack implementation - all confirmed for use with the M30281FAHP#U3B in the M16C/28 Group Hardware Manual.