Renesas M38235G6FP#U0

Overview

M38235G6FP#U0 from Renesas Electronics is an 8-bit CMOS microcomputer based on the 740 family core, featuring integrated LCD drive control (4 commons, 32 segments), 10-bit 8-channel A/D converter, UART/clock-synchronized serial interface, and 8-bit × 3 / 16-bit × 2 timers. It operates from 1.8 V to 5.5 V across multiple clock modes and targets low-power consumer display applications such as digital cameras and audio equipment.

For engineers reviewing the M38235G6FP#U0 datasheet, M38235G6FP#U0 pinout, M38235G6FP#U0 application, or M38235G6FP#U0 equivalent, key selection considerations include its QzROM-based 24 KB program memory, 640-byte RAM (including LCD RAM), 80-pin QFP package with key-on wake-up inputs (KW0–KW7), and dual-clock system supporting external ceramic resonator (XIN/XOUT) and sub-clock crystal (XCIN/XCOUT).

Technical Context

The M38235G6FP#U0 implements the standard 740-family instruction set (71 instructions) with 0.4 µs minimum instruction execution time at 10 MHz in high-speed mode. Its CPU includes accumulator, index registers X/Y, stack pointer, and 16-bit program counter with interrupt vectoring across 16 vectors.

It integrates a dedicated LCD controller supporting 1/2, 1/3, or 1/4 bias and 2–4 duty ratios, alongside real-time port (RTP0/RTP1), watchdog timer (8-bit), ROM correction function (32 bytes × 2 blocks), and programmable pull-up/pull-down resistors on ports P0–P7 (excluding P40).

Key Specifications

Pinout & Package

Package: 80-pin plastic-molded QFP (PRQP0080GB-A, 0.8 mm pitch), surface-mount, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M38235G6FP#U0, the HP variant offers identical electrical behavior in a denser LQFP package, while the M38234G4FP#U0 reduces ROM capacity and removes ROM correction-making it appropriate for simpler, fixed-function applications with tighter BOM constraints.

Availability

M38235G6FP#U0 is available at Aetrix Electronics and suitable for digital camera displays, portable audio UIs, smart home appliance panels, and industrial handheld meters requiring stable component supply across extended production lifecycles.

Supply support for M38235G6FP#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-effective, low-power consumer electronics with integrated LCD and A/D capabilities-targeting applications where display control, sensor interfacing, and battery longevity are critical.

FAQ

What is the maximum operating frequency of the M38235G6FP#U0?

The M38235G6FP#U0 supports a maximum oscillation frequency of 10 MHz in high-speed mode, delivering a minimum instruction execution time of 0.4 µs. This frequency applies when using the main clock (XIN/XOUT) with external ceramic resonator or quartz crystal; sub-clock operation is limited to 32 kHz for low-power timing functions.

Does the M38235G6FP#U0 support in-circuit programming or debugging?

The M38235G6FP#U0 uses QzROM (one-time programmable ROM) and does not support in-circuit reprogramming. Debugging requires external emulators compatible with the 740-family architecture; no on-chip debug interface (e.g., JTAG or SWD) is integrated into the M38235G6FP#U0.

How many LCD segments can the M38235G6FP#U0 drive simultaneously?

The M38235G6FP#U0 drives up to 32 segment outputs and 4 common outputs, supporting LCD configurations with 1/2, 1/3, or 1/4 bias and 2-, 3-, or 4-multiplex duty. Segment pins include dedicated SEG0–SEG11 and port-mapped SEG12–SEG31 (via P00–P17), totaling 32 addressable segments in full configuration.

What are the power supply requirements for the M38235G6FP#U0's analog section?

The M38235G6FP#U0 requires separate analog ground (AVSS) tied to VSS and an analog reference voltage (VREF) supplied externally-typically derived from VCC or a precision divider. The A/D converter operates correctly only when VREF is stable and within 0.5 V to VCC, and AVSS is noise-cleaned with local decoupling.

Is the M38235G6FP#U0 pin-compatible with other members of the 3823 Group?

Yes-the M38235G6FP#U0 shares identical pinout and package (PRQP0080GB-A QFP) with all FP-suffixed 3823 Group variants, including M38234G4FP#U0 and M38238G8FP#U0. Peripheral register maps and interrupt vectors are consistent across the group, enabling firmware reuse with memory-size adjustments.