Renesas M30281FAHP#U9B

Overview

M30281FAHP#U9B 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 CPU clock (via PLL), and supports 3.3 V or 5 V operation with built-in voltage detection and watchdog timer.

For engineers reviewing the M30281FAHP#U9B datasheet, M30281FAHP#U9B pinout, M30281FAHP#U9B application, or M30281FAHP#U9B equivalent, key selection considerations include Flash endurance (10,000 write/erase cycles), real-time interrupt latency (<1 µs), IEBus interface support, and compatibility with Renesas' M16C development toolchain including E8 emulator and HEW IDE.

Technical Context

The M30281FAHP#U9B implements the M16C/28 architecture with a 16-bit CISC CPU core, supporting both 16-bit and 32-bit arithmetic operations. It integrates a programmable PLL for flexible clock generation (up to 48 MHz), on-chip oscillation stop detection with automatic recovery, and dual clock sources (main crystal and sub-crystal) for fail-safe timing.

Peripheral integration includes 12-bit ADC (8 channels), UART ×2, I²C-compatible serial interface, 16-bit timer arrays (TMR0–TMR3), PWM output capability, and dedicated IEBus controller for automotive body electronics communication. Memory protection is enforced via SFR-access restrictions and reset vector validation.

Key Specifications

Pinout & Package

This device is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad for enhanced heat dissipation in industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M30281FAHP#U9B, R5F21282SDFP#V0 offers backward-compatible migration path with improved Flash reliability, while HD64F2228F20 trades IEBus integration for raw computational performance - making M30281FAHP#U9B optimal for cost-sensitive, IEBus-dependent automotive body electronics where proven qualification and toolchain stability are critical.

Availability

M30281FAHP#U9B is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, home appliance main controllers, and medical auxiliary HMI systems requiring stable component supply across long production lifecycles.

Supply support for M30281FAHP#U9B 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, including M30281FAHP#U9B, was engineered for cost-effective, high-reliability embedded control in automotive body electronics and industrial equipment - emphasizing peripheral integration, low-power modes, and long-term manufacturability.

FAQ

What is the maximum operating frequency of the M30281FAHP#U9B?

The M30281FAHP#U9B achieves a maximum CPU clock frequency of 48 MHz using its on-chip PLL, which multiplies an external crystal input (e.g., 8 MHz) by a factor of six. This frequency is fully supported across the specified operating voltage range (3.0 V to 5.5 V) and ambient temperature range (−40°C to +85°C). The M30281FAHP#U9B's timing specifications, including instruction cycle times and peripheral response latencies, are guaranteed up to this 48 MHz limit.

Does the M30281FAHP#U9B support IEBus communication natively?

Yes, the M30281FAHP#U9B includes a dedicated hardware IEBus controller compliant with JEDEC JIS X 0302-1997. It handles physical layer signaling, frame formatting, CRC calculation, arbitration, and error recovery without CPU intervention. The M30281FAHP#U9B uses four dedicated pins (IEBUS0–IEBUS3) for differential IEBus transmission and reception, enabling robust 125 kbps communication in automotive environments with minimal software overhead.

What are the memory resources available on the M30281FAHP#U9B?

The M30281FAHP#U9B integrates 256 KB of on-chip Flash memory for program and constant storage, rated for 10,000 write/erase cycles, and 16 KB of SRAM for runtime variables and stack. It also supports external memory expansion via its 24-bit address bus and dedicated wait-state control. These memory resources are mapped into a unified 24-bit address space, allowing the M30281FAHP#U9B to execute code directly from Flash while maintaining efficient data access in SRAM.

How does the M30281FAHP#U9B handle power supply monitoring and reset events?

The M30281FAHP#U9B incorporates multiple independent reset sources: hardware reset (active-low RESET pin), watchdog timer timeout, oscillation stop detection, and low-voltage detection (LVD) with four programmable thresholds (2.5 V, 3.0 V, 3.5 V, 4.0 V). Each source triggers a defined reset sequence that clears CPU registers, initializes peripherals, and vectors to the reset handler. The M30281FAHP#U9B's LVD can generate either an interrupt or a reset, enabling graceful shutdown or recovery depending on system requirements.

Is the M30281FAHP#U9B qualified for automotive applications?

The M30281FAHP#U9B carries Renesas' "Standard" quality grade, which covers automotive body electronics such as door modules, lighting controls, and HVAC interfaces - as explicitly stated in Renesas documentation. It meets AEC-Q100 stress test requirements for temperature cycling, humidity, and ESD when used within its specified operating conditions. However, it is not certified for safety-critical powertrain or chassis systems, which require Renesas' "High Quality" grade devices. The M30281FAHP#U9B remains widely deployed in production automotive ECUs where functional safety is managed at the system level.