Renesas M30281FCHP#U3B

Overview

M30281FCHP#U3B from Renesas Electronics is a 16-bit single-chip microcontroller in the M16C/28 Group, designed for embedded control with integrated flash memory, on-chip RAM, and peripheral functions including UART, PWM, and I²C-compatible serial interface. It operates at up to 20 MHz CPU clock, supports 3.3 V or 5 V supply, and features low-power STOP/WAIT modes for battery-sensitive applications such as industrial sensors and motor controllers.

For engineers reviewing the M30281FCHP#U3B datasheet, M30281FCHP#U3B pinout, M30281FCHP#U3B application, or M30281FCHP#U3B equivalent, key selection criteria include its 128 KB on-chip flash, 8 KB RAM, 10-bit ADC with 16 channels, 16-bit timer/counters with capture/compare, and support for both main and sub-clock oscillators - critical for deterministic real-time control in resource-constrained systems.

Technical Context

The M30281FCHP#U3B implements the M16C CPU core with 16-bit data bus and 24-bit address space, enabling direct access to up to 16 MB of memory. Its clock generation circuit includes selectable main clock (1–20 MHz crystal), sub-clock (32.768 kHz), on-chip oscillator (1 MHz), and PLL multiplier for internal high-speed operation.

Interrupt handling supports 128 vector entries with priority levels (IPL0–IPL7), and the peripheral module set includes three 16-bit timers (TMR0–TMR2), two serial interfaces (UART/SIO), watchdog timer, voltage detection circuit, and 10-bit ADC with sample-and-hold - all mapped to dedicated SFRs and controllable via bit-manipulation instructions.

Key Specifications

Pinout & Package

The M30281FCHP#U3B is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow the M16C/28 Group standard layout, supporting multiplexed I/O, dedicated power/ground, and configurable peripheral function mapping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21282SDFP#30 and HD64F2228F20, the M30281FCHP#U3B offers optimal balance of legacy code compatibility, I/O density, and low-power capability - making it the preferred choice for cost-sensitive, volume industrial control upgrades where minimal hardware change is required.

Availability

M30281FCHP#U3B is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, home appliance panels, and factory automation I/O modules requiring stable component supply across extended production lifecycles.

Supply support for M30281FCHP#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 applications.

The M16C/28 Group, including the M30281FCHP#U3B, was engineered for deterministic real-time control in cost-sensitive industrial equipment - emphasizing robust peripheral integration, low-power operation, and long-term manufacturability.

FAQ

What is the maximum operating frequency of the M30281FCHP#U3B?

The M30281FCHP#U3B supports a maximum CPU clock frequency of 20 MHz when driven by an external crystal connected to the XIN/XOUT pins. This frequency is achieved using the on-chip PLL with 2× multiplication of a 10 MHz input, or directly from a 20 MHz crystal. The device maintains full functionality-including ADC conversion, timer operation, and UART communication-at this rated speed under specified voltage and temperature conditions. M30281FCHP#U3B datasheets confirm timing margins meet all internal setup/hold requirements at 20 MHz.

Does the M30281FCHP#U3B include on-chip debug support?

Yes, the M30281FCHP#U3B integrates on-chip debugging circuitry compatible with Renesas E8/E8a emulators via the dedicated DBG pin and SWD-like serial interface. This allows full breakpoint, step-through, and register inspection capabilities without requiring external JTAG hardware. Debug functionality remains active in all non-STOP modes and does not consume user RAM or flash resources. M30281FCHP#U3B supports both flash programming and real-time variable monitoring during development.

Can the M30281FCHP#U3B operate from a 3.3 V supply?

Yes, the M30281FCHP#U3B is fully specified for operation from 3.0 V to 5.5 V, including stable 3.3 V operation across the full industrial temperature range (−40°C to +85°C). All I/O pins are 5 V tolerant when configured as inputs, allowing direct interface with 5 V peripherals without level shifters. The internal voltage regulator and clock circuits maintain timing integrity at 3.3 V, and the 10-bit ADC achieves full specification (±1 LSB INL) at this supply level. M30281FCHP#U3B's electrical characteristics table explicitly lists 3.3 V parameters.

How many I/O pins does the M30281FCHP#U3B provide?

The M30281FCHP#U3B provides up to 82 individually configurable CMOS I/O pins across Ports 0–7 and special function pins. These include 16 dedicated ADC input channels, 8 dedicated UART/SIO signal lines, and 12 timer-related pins (PWM outputs, capture inputs), all multiplexed onto physical pins. Each port supports programmable pull-up resistors and can be set as input, output, or alternate function. M30281FCHP#U3B's pin assignment diagram confirms 82 usable I/O signals in the 100-pin LQFP package.

Is the M30281FCHP#U3B qualified for automotive applications?

No, the M30281FCHP#U3B is classified as a "Standard" quality grade device per Renesas documentation and is intended for industrial, office, and consumer applications - not automotive or safety-critical systems. It lacks AEC-Q100 qualification, extended temperature screening, and automotive-specific failure rate data. For automotive use, Renesas recommends the RH850 or RL78/F1x families. M30281FCHP#U3B's product brief explicitly excludes transportation equipment and medical life-support applications.