Renesas M30281FATHP

Overview

M30281FATHP 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 real-time responsiveness. It features 256 KB on-chip flash memory, 16 KB RAM, a 16-bit CPU core operating at up to 20 MHz, and supports IEBus, UART, and PWM interfaces - commonly deployed in industrial motor control and HVAC system management.

For engineers reviewing the M30281FATHP datasheet, M30281FATHP pinout, M30281FATHP application, or M30281FATHP equivalent, key selection considerations include its 100-pin LQFP package, 3.3 V ±10% supply voltage range, built-in voltage detection circuit with reset capability, and support for WAIT/STOP low-power modes - all critical for resource-constrained, safety-aware embedded designs.

Technical Context

The M30281FATHP implements the M16C CPU architecture with 24-bit address space, supporting both 16-bit and 32-bit arithmetic operations. Its clock generation circuit includes main clock (1–20 MHz), sub-clock (32.768 kHz), on-chip oscillator, and PLL for flexible frequency synthesis - enabling configurable CPU clock (f_CLK) and peripheral clocks (f₁, f₂, f₈, f₃₂, f_AD, etc.) with independent gating control.

Interrupt handling uses a 16-level priority scheme with vector table base register (INTB), supporting 128 interrupt sources including external pins, timer overflows, serial communication events, and watchdog timeout. The device integrates a 10-bit ADC with 16 channels, 32-bit watchdog timer, and low-voltage detection circuit triggering interrupt or reset at programmable thresholds (e.g., 2.7 V or 3.0 V).

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, surface-mountable with thermal pad for enhanced heat dissipation in enclosed industrial enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M30281FATHP, R5F102AAASP offers superior energy efficiency and modern development tools but requires redesign for IEBus integration, while M30282F8HP provides mechanical and electrical compatibility at the expense of peripheral functionality - making M30281FATHP the sole option for IEBus-dependent legacy systems.

Availability

M30281FATHP is available at Aetrix Electronics and suitable for industrial motor control, HVAC system management, smart energy metering, and factory automation I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for M30281FATHP 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 applications.

The M16C/28 Group was developed for cost-effective, high-reliability embedded control in industrial equipment and building systems - emphasizing integrated peripherals, robustness under voltage fluctuation, and long-term availability for maintenance-critical infrastructure.

FAQ

What is the maximum operating frequency of the M30281FATHP?

The M30281FATHP supports a maximum CPU clock frequency of 20 MHz when using the on-chip PLL with an external main clock input. This frequency is achievable with a 1–20 MHz crystal connected to XT1/XT2 and proper PLL configuration. At 20 MHz, the M30281FATHP delivers deterministic instruction execution with a 50 ns cycle time, enabling tight real-time control loops. The device also supports lower-frequency operation down to DC for ultra-low-power STOP mode applications.

Does the M30281FATHP include on-chip flash memory, and what is its endurance rating?

Yes, the M30281FATHP integrates 256 KB of on-chip flash memory rated for 100,000 write/erase cycles and guaranteed data retention of 10 years at 85°C. This flash is used for program storage and supports in-application programming (IAP), allowing firmware updates without external programmers. The M30281FATHP's flash architecture includes block protection and security features to prevent unauthorized readout or modification - critical for deployed industrial firmware integrity.

What communication interfaces are supported by the M30281FATHP?

The M30281FATHP supports multiple communication interfaces including UART (two channels), IEBus (dedicated hardware controller), and synchronous serial I/O (SSI). It does not include CAN, USB, or Ethernet controllers. The integrated IEBus module complies with IEC 62056-21 and handles physical layer timing, frame formatting, and CRC generation autonomously - reducing CPU overhead in metering and building automation applications where IEBus is mandated.

Is the M30281FATHP pin-compatible with other members of the M16C/28 Group?

Yes, the M30281FATHP is pin-compatible with other 100-pin LQFP variants in the M16C/28 Group, such as M30282F8HP and M30281FAHP, sharing identical pin assignments for power, reset, clock, and primary I/O ports. However, functional differences exist - for example, M30282F8HP omits the IEBus controller and has reduced flash capacity. Pin compatibility enables PCB reuse, but firmware and peripheral initialization must be verified against the specific variant's feature set before substitution.

What low-power modes does the M30281FATHP support, and how do they affect peripheral operation?

The M30281FATHP supports WAIT mode (CPU halted, peripherals and interrupts active) and STOP mode (all clocks stopped except optional sub-clock). In WAIT mode, UART, timers, and ADC remain operational, enabling wake-up on serial activity or timer expiry. In STOP mode, only the 32.768 kHz sub-clock and associated wakeup sources (e.g., external interrupt, LVD) remain active, reducing current to 1.2 μA. Both modes preserve RAM and register contents, ensuring fast resumption of control tasks without full reinitialization - vital for battery-powered remote sensors and energy-harvesting nodes.