Renesas M306NKFHGP#U3

Overview

M306NKFHGP#U3 from Renesas Electronics is a 16-bit microcontroller in the M16C/6N Group (M16C/6N4), featuring 256 KB on-chip Flash memory, 16 KB RAM, and integrated peripherals including UART, I²C, PWM timers, and 10-bit ADC. It operates at up to 20 MHz CPU clock and targets embedded control in industrial equipment and consumer appliances.

For engineers reviewing the M306NKFHGP#U3 datasheet, M306NKFHGP#U3 pinout, M306NKFHGP#U3 application, or M306NKFHGP#U3 equivalent, key selection criteria include Flash endurance (10,000 write/erase cycles), operating voltage range (2.7–5.5 V), and support for single-supply Flash programming - critical for field-upgradable industrial controllers.

Technical Context

The M306NKFHGP#U3 implements the M16C CPU core with 16-bit data bus and 24-bit address bus, supporting both Harvard and von Neumann memory models via configurable bus modes. It integrates a PLL clock generator enabling 1× to 8× multiplication of external crystal inputs (1–10 MHz) to achieve stable 20 MHz internal operation.

Peripheral subsystems include three 16-bit multifunction timers with capture/compare/PWM capability, a 10-bit 12-channel ADC with conversion time as low as 1.2 μs, and dual UART channels supporting asynchronous communication at up to 2 Mbps with framing and parity error detection.

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 R5F100LEAFB#30 and MB95560PFT-G-SNE1, the M306NKFHGP#U3 delivers balanced performance, mature industrial qualification, and native 5 V compatibility - making it optimal for cost-sensitive, mixed-voltage legacy industrial upgrades where CAN 2.0B suffices and Flash endurance is critical.

Availability

M306NKFHGP#U3 is available at Aetrix Electronics and suitable for industrial motor control, home appliance MCU, and factory automation I/O modules requiring stable component supply and long-term lifecycle assurance.

Supply support for M306NKFHGP#U3 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 markets.

The M16C Family was designed for robust, cost-effective embedded control in industrial equipment and consumer appliances - emphasizing Flash reliability, mixed-signal integration, and long-lifecycle support.

FAQ

What is the maximum operating frequency of the M306NKFHGP#U3?

The M306NKFHGP#U3 supports a maximum CPU clock frequency of 20 MHz, achieved via its on-chip PLL that multiplies external crystal inputs (1–10 MHz). This yields a 50 ns instruction cycle time, enabling deterministic real-time execution for motor control and sensor processing tasks. The M306NKFHGP#U3 maintains timing integrity across its full −40 °C to +85 °C operating range without derating.

Does the M306NKFHGP#U3 support in-system programming without high-voltage VPP?

Yes, the M306NKFHGP#U3 supports single-supply Flash programming using only the standard VCC supply (2.7–5.5 V), eliminating the need for external VPP circuitry. This capability is implemented through on-chip charge pumps and verified for 10,000 write/erase cycles. Firmware updates can be performed in-system via UART or CAN, making the M306NKFHGP#U3 suitable for field-deployed industrial controllers.

What package type and pin count does the M306NKFHGP#U3 use?

The M306NKFHGP#U3 is housed in a 100-pin LQFP package measuring 14 mm × 14 mm with 0.5 mm pitch. It features four VCC and four VSS pins distributed across the perimeter to minimize power supply impedance and improve noise immunity. The pinout includes dedicated JTAG debug pins (TCK/TMS/TDI/TDO), dual UART channels, and CAN 2.0B transceiver interface signals - all mapped to non-overlapping I/O ports per the M16C/6N4 hardware manual.

Is the M306NKFHGP#U3 qualified for automotive applications?

No, the M306NKFHGP#U3 is rated as a Standard quality grade device per Renesas' classification, intended for industrial equipment, office automation, and consumer appliances. It is not AEC-Q100 qualified and lacks automotive-specific features such as extended temperature range (−40 °C to +125 °C), enhanced ESD protection, or fault-tolerant CAN. For automotive use, Renesas recommends the RH850 or RL78/F1x families instead of the M306NKFHGP#U3.

What debug interface does the M306NKFHGP#U3 support?

The M306NKFHGP#U3 supports IEEE 1149.1 JTAG-compliant on-chip debugging via dedicated TCK, TMS, TDI, and TDO pins. This interface enables full visibility into CPU registers, memory, and peripheral states during development and validation. Debug functionality is retained even when Flash security bits are partially enabled - allowing secure firmware development without exposing production code. The M306NKFHGP#U3 does not support SWD or serial-wire debug.