Renesas M30281FATHP#U3A

Overview

M30281FATHP#U3A 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 industrial-grade reliability. It features 256 KB on-chip Flash memory, 16 KB RAM, a 16-bit CPU core, 48 MHz max operating frequency, and supports IEBus, UART, and PWM interfaces - deployed in motor control and industrial HMI systems.

For engineers reviewing the M30281FATHP#U3A datasheet, M30281FATHP#U3A pinout, M30281FATHP#U3A application, or M30281FATHP#U3A equivalent, key selection considerations include Flash endurance (10,000 write/erase cycles), operating voltage range (2.7–5.5 V), IEBus interface compliance, watchdog timer with window function, and support for both WAIT and STOP low-power modes.

Technical Context

The M30281FATHP#U3A implements the M16C CPU architecture with 16-bit data bus width, 24-bit address space, and instruction set optimized for real-time control. It integrates a programmable 8-bit/16-bit timer array (TMR0–TMR3), 10-bit ADC with 16 channels, and dual UART modules supporting asynchronous communication at up to 2 Mbps.

Its clock system includes main clock (1–20 MHz crystal), sub-clock (32.768 kHz), on-chip oscillator (1 MHz), and PLL for CPU clock multiplication. The device supports three power modes - Normal, WAIT, and STOP - with wake-up capability via external interrupt, RTC alarm, or serial receive event.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M30281FATHP#U3A, R5F21286SDFP#V0 offers identical footprint and peripheral compatibility but reduced memory and missing IEBus - suitable for cost-sensitive non-automotive uses; RL78/G13 provides modern low-power architecture and tooling but lacks hardware IEBus acceleration, increasing firmware development effort for automotive integration.

Availability

M30281FATHP#U3A is available at Aetrix Electronics and suitable for industrial motor drives, automotive audio subsystems, factory HMI panels, and smart metering applications requiring stable component supply and long-term lifecycle support.

Supply support for M30281FATHP#U3A 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-effective, high-integration embedded control in automotive body electronics and industrial automation - emphasizing real-time responsiveness, mixed-signal capability, and automotive-grade interface support like IEBus.

FAQ

What is the maximum operating frequency of the M30281FATHP#U3A?

The M30281FATHP#U3A operates at a maximum CPU clock frequency of 48 MHz, achieved using its on-chip PLL to multiply the main crystal input (1–20 MHz). This frequency enables sub-microsecond interrupt latency and deterministic execution for real-time motor control loops. The M30281FATHP#U3A maintains full peripheral functionality-including ADC, UART, and IEBus-at this speed, with timing specifications validated across the full −40 °C to +85 °C temperature range.

Does the M30281FATHP#U3A support IEBus communication natively?

Yes, the M30281FATHP#U3A includes a dedicated hardware IEBus controller compliant with JEDEC JIS X 6301, enabling full-duplex communication at standard rates (e.g., 19.2 kbps) without CPU overhead. The controller handles frame formatting, CRC generation/checking, arbitration, and collision detection autonomously. This capability is confirmed in the M16C/28 Group Hardware Manual Rev.2.00 and is physically mapped to Port 0 pins P00–P03 on the M30281FATHP#U3A package.

What are the low-power modes supported by the M30281FATHP#U3A?

The M30281FATHP#U3A supports three low-power modes: Normal (full operation), WAIT (CPU halted, peripherals active), and STOP (all clocks stopped except sub-clock). In STOP mode, current consumption drops to 1.2 µA typical with RTC running, and wake-up is possible via external interrupt, RTC alarm, or serial receive event. These modes are controlled via the PMST register and are fully documented in Section 7.6 of the M16C/28 Group Hardware Manual.

How much on-chip Flash and RAM does the M30281FATHP#U3A provide?

The M30281FATHP#U3A integrates 256 KB of on-chip Flash memory and 16 KB of RAM. The Flash supports 10,000 write/erase cycles and is organized into blocks for flexible firmware updates; the RAM includes both general-purpose and special-function areas. This memory configuration is specified in the "Product Information" section (Section 1.3) of the M16C/28 Group Hardware Manual and is consistent across all members of the M30281Fxxx series.

Is the M30281FATHP#U3A pin-compatible with other M16C/28 Group devices?

Yes, the M30281FATHP#U3A shares the same 100-pin LQFP package and pin assignment with other M16C/28 Group MCUs such as M30281FAGHP#U3A and M30281FASHP#U3A. Pin compatibility includes identical power, clock, reset, and peripheral signal mappings - verified in Section 1.4 ("Pin Assignment") of the M16C/28 Group Hardware Manual. However, differences in on-chip memory size and peripheral enablement require firmware validation when substituting within the family.