Renesas M38234G4FP#U0

Overview

M38234G4FP#U0 from Renesas Electronics is an 8-bit CMOS microcontroller based on the 740 family core, featuring 16 KB QzROM, 640 bytes RAM, integrated LCD drive control (1/2 or 1/3 bias, up to 4 commons and 32 segments), 8-channel 10-bit A/D converter, and dual clock systems (main ceramic resonator or quartz input + sub-clock crystal or on-chip oscillator). It targets low-power consumer display applications such as digital camera controls and portable audio interfaces.

For engineers reviewing the M38234G4FP#U0 datasheet, M38234G4FP#U0 pinout, M38234G4FP#U0 application, or M38234G4FP#U0 equivalent, key selection criteria include its 80-pin QFP package, 1.8–5.5 V wide supply range with ultra-low 18 µW standby power at 32 kHz sub-clock, and native support for key-on wake-up interrupt across 8 dedicated input pins.

Technical Context

The M38234G4FP#U0 implements a standard 740-family CPU with 71 basic instructions and a minimum instruction execution time of 0.4 µs at 10 MHz in high-speed mode. Its memory subsystem includes 16 KB of QzROM (user-accessible 16,254 bytes) and 640 bytes of RAM - including space allocated for LCD display RAM and ROM correction blocks.

Timing architecture integrates two independent clock domains: a main system clock (up to 10 MHz via external ceramic resonator or quartz crystal between XIN/XOUT) and a sub-clock domain (32 kHz crystal or on-chip oscillator on XCIN/XCOUT), enabling low-power real-time operation with hardware-assisted key-on wake-up and RTC-like functionality.

Key Specifications

Pinout & Package

Package: PRQP0080GB-A - 80-pin plastic-molded QFP, 0.8 mm pitch, body size 14 × 14 mm, exposed pad not specified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with M38234G4FP#U0, the M38234G4HP#U0 offers identical functionality in a denser LQFP package for space-constrained designs, while the M38235G6FP#U0 provides 8 KB more ROM and 128 bytes more RAM - enabling richer feature sets without altering peripheral usage or PCB layout.

Availability

M38234G4FP#U0 is available at Aetrix Electronics and suitable for digital camera controls, portable audio interfaces, and smart home appliance keypads requiring stable component supply and long-term production continuity.

Supply support for M38234G4FP#U0 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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions.

The 3823 Group was designed specifically for cost-sensitive, low-power consumer electronics with integrated LCD and analog front-end capabilities - targeting applications where display, keypad, and sensor interfacing dominate system requirements.

FAQ

What is the maximum operating frequency of the M38234G4FP#U0?

The M38234G4FP#U0 supports a maximum main clock frequency of 10 MHz in high-speed mode, yielding a minimum instruction execution time of 0.4 µs. This timing assumes operation with an external ceramic resonator or quartz crystal connected to XIN/XOUT and VCC within the 4.5–5.5 V range for frequency/2 mode.

Does the M38234G4FP#U0 support external crystal oscillators on both main and sub-clock inputs?

Yes, the M38234G4FP#U0 supports external quartz crystals on both clock domains: the main clock (XIN/XOUT) accepts crystals up to 10 MHz, while the sub-clock (XCIN/XCOUT) is designed exclusively for 32 kHz crystals. External clock signals are not supported on XCIN - only crystal or on-chip oscillator modes are valid.

How many LCD segments can the M38234G4FP#U0 drive, and what bias/duty configurations are supported?

The M38234G4FP#U0 drives up to 32 LCD segments with 4 commons. It supports 1/2 or 1/3 bias and 1/2, 1/3, or 1/4 duty ratios. COM2 and COM3 are inactive at 1/2 duty; COM3 is inactive at 1/3 duty - allowing flexible display sizing without external bias resistors.

What is the purpose of the ROM correction function in the M38234G4FP#U0?

The M38234G4FP#U0 includes two 32-byte ROM correction blocks (64 bytes total) that allow targeted patching of QzROM code in-system. This enables post-manufacturing bug fixes or minor functional updates without full ROM reprogramming - critical for field-deployed consumer devices.

Can the M38234G4FP#U0 operate from a single 3.3 V supply?

Yes, the M38234G4FP#U0 operates across 1.8–5.5 V, fully supporting 3.3 V nominal supplies in all modes. At 3.3 V, it achieves stable operation up to 8 MHz in frequency/2 mode and maintains full peripheral functionality including LCD drive, A/D conversion, and key-on wake-up.