Renesas M30281FCHP#U5B

Overview

M30281FCHP#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, 8-channel 10-bit ADC, and integrated UART, I²C, and IE-Bus interfaces. It is used in motor control modules requiring real-time response and deterministic interrupt latency.

For engineers reviewing the M30281FCHP#U5B datasheet, M30281FCHP#U5B pinout, M30281FCHP#U5B application, or M30281FCHP#U5B equivalent, key selection criteria include Flash endurance (10,000 write/erase cycles), operating voltage range (2.7–5.5 V), I/O drive capability (20 mA sink/source per port), and support for low-power Stop/Wait modes with fast wake-up (<10 µs from Stop).

Technical Context

The M30281FCHP#U5B implements the M16C CPU core with 16-bit data bus and 24-bit address space, supporting both CISC instruction set and bit-manipulation instructions for efficient peripheral control. It integrates a programmable watchdog timer, on-chip voltage detector (2.6 V threshold), and oscillation stop detection circuit with automatic recovery.

Its clock system supports multiple sources: main crystal (1–10 MHz), sub-crystal (32.768 kHz), on-chip oscillator (1 MHz), and PLL-based CPU clock up to 16 MHz. Peripheral clocks are independently configurable via prescalers for UART, ADC, and timer units - enabling precise timing control without CPU overhead.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, standard JEDEC MO-140 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21285SNFP#U0 and MB90F387G, the M30281FCHP#U5B uniquely retains full IE-Bus hardware support in a 100-pin LQFP package with identical memory size - making it irreplaceable in legacy NEC-compatible appliance and automotive subsystems requiring drop-in compatibility.

Availability

M30281FCHP#U5B is available at Aetrix Electronics and suitable for industrial motor control, home appliance development, automotive body electronics, and smart power management systems requiring stable component supply and long-term lifecycle support.

Supply support for M30281FCHP#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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The M16C/28 Group, including the M30281FCHP#U5B, was engineered for cost-sensitive, real-time embedded control in appliances and industrial equipment - emphasizing integration, low-power operation, and legacy bus compatibility (IE-Bus, UART, I²C).

FAQ

What is the maximum operating frequency of the M30281FCHP#U5B?

The M30281FCHP#U5B supports a maximum CPU clock frequency of 16 MHz, achieved via its on-chip PLL when driven by a 1–10 MHz main crystal. This yields approximately 16 MIPS performance, sufficient for real-time motor control loops and protocol stack processing. The M30281FCHP#U5B maintains timing specification compliance across its full 2.7–5.5 V supply range and industrial temperature grade (−40°C to +85°C).

Does the M30281FCHP#U5B support in-system programming (ISP)?

Yes, the M30281FCHP#U5B supports in-system programming via its on-chip boot ROM and UART0 interface. Firmware updates can be performed without removing the device from the PCB, using Renesas' Flash Development Toolkit (FDT) and standard RS-232 or TTL-level UART connections. The M30281FCHP#U5B requires no external programming voltage and retains full Flash functionality during ISP operations.

What is the purpose of the IE-Bus interface in the M30281FCHP#U5B?

The IE-Bus (Inter-Equipment Bus) interface in the M30281FCHP#U5B is a proprietary 2-wire, half-duplex serial bus developed by NEC for communication between audio, climate, and display modules in automotive and consumer electronics. The M30281FCHP#U5B integrates dedicated hardware logic to handle IE-Bus protocol framing, CRC generation, and arbitration - offloading these tasks from the CPU and ensuring deterministic timing.

Can the M30281FCHP#U5B operate from a 3.3 V supply?

Yes, the M30281FCHP#U5B operates reliably across a supply voltage range of 2.7 V to 5.5 V, fully supporting 3.3 V nominal systems. At 3.3 V, it achieves up to 12 MHz CPU clock (PLL bypassed) or 16 MHz with reduced noise margin - all electrical characteristics, including I/O drive strength and ADC accuracy, are guaranteed per datasheet specifications. The M30281FCHP#U5B includes an internal voltage regulator for core logic, ensuring stable operation independent of VCC fluctuations.

What debug interface does the M30281FCHP#U5B support?

The M30281FCHP#U5B supports on-chip debugging via the Renesas E8/E8a emulator interface using the 6-pin JTAG-compatible connector (TCK, TMS, TDI, TDO, TRST, RESET). It enables full hardware breakpointing, real-time variable watch, and flash programming through Renesas' High-performance Embedded Workshop (HEW) IDE. The M30281FCHP#U5B does not support SWD or ARM-style debug; its debug architecture is specific to the M16C core and requires Renesas-certified tools.