Renesas M38D24G4FP#U0

Overview

M38D24G4FP#U0 from Renesas Electronics is a single-chip 8-bit CMOS microcomputer in the 38D2 Group, based on the 740 Family core. It integrates LCD drive control (4 COM × 24 SEG), 10-bit × 8-channel A/D converter, dual UART/Clock-synchronous serial interfaces, 8-bit × 4 and 16-bit × 2 timers, 10-bit × 2 + 16-bit × 1 PWM, and on-chip oscillator - designed for embedded control in consumer appliance displays and sensor-actuated panels.

For engineers reviewing the M38D24G4FP#U0 datasheet, M38D24G4FP#U0 pinout, M38D24G4FP#U0 application, or M38D24G4FP#U0 equivalent, key selection considerations include its QzROM version (16 KB ROM / 640 B RAM), LQFP-64 package, 1.8–5.5 V operating range, −20 to +85°C industrial temperature grade, and integrated LCD/LED driver capability with 24 segment outputs.

Technical Context

The M38D24G4FP#U0 implements the 740 Family instruction set (71 basic instructions) with minimum execution time of 0.32 μs at 12.5 MHz. Its clock system supports dual oscillation sources: main clock via external ceramic resonator (XIN/XOUT) or internal on-chip oscillator (selected by OSCSEL), plus sub-clock via external 32 kHz quartz (XCIN/XCOUT).

It features dedicated hardware peripherals including an LCD controller with programmable bias (1/2 or 1/3) and duty (2/3/4), real-time port (RTP) inputs for touch sensing, ADKEY function on P42, and segmented I/O ports where P0–P2 share 24 pins with SEG outputs - enabling direct drive of multiplexed LCDs without external drivers.

Key Specifications

Pinout & Package

Package: 64-pin plastic molded LQFP (PLQP0064GA-A, 0.8 mm pitch), RoHS-compliant, industrial-grade thermal profile (−20 to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with M38D24G4FP#U0, M38D24G6FP#U0 offers 50% more ROM for enhanced UI logic without changing layout, while M38D29GF#U0 doubles RAM and quadruples ROM - supporting real-time task scheduling and firmware updates in resource-constrained home electronics.

Availability

M38D24G4FP#U0 is available at Aetrix Electronics and suitable for refrigerator control panels, smart thermostat displays, and induction cooktop user interfaces requiring stable component supply across multi-year production cycles.

Supply support for M38D24G4FP#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 specializing in microcontrollers, analog, and power solutions for industrial, automotive, and consumer markets.

The 38D2 Group - including M38D24G4FP#U0 - was designed for cost-effective, high-integration embedded control in household appliances with integrated display and sensor interfaces.

FAQ

What is the memory configuration of the M38D24G4FP#U0?

The M38D24G4FP#U0 contains 16 KB of QzROM (with 16,254 bytes user-accessible) and 640 bytes of RAM. This fixed-program memory structure targets high-volume, cost-sensitive applications where firmware is finalized before manufacturing - eliminating the need for in-system programming infrastructure. The M38D24G4FP#U0 does not support flash reprogramming.

Does the M38D24G4FP#U0 support external crystal oscillators?

Yes, the M38D24G4FP#U0 supports two independent clock sources: a main clock via XIN/XOUT (for ceramic resonators up to 12.5 MHz) and a sub-clock via XCIN/XCOUT (for 32.768 kHz quartz crystals). The sub-clock enables precise real-time clock functionality and ultra-low-power wake-up modes - critical for battery-operated thermostats and remote controls using the M38D24G4FP#U0.

How many LCD segments can the M38D24G4FP#U0 drive directly?

The M38D24G4FP#U0 drives up to 24 LCD segments across 4 common lines (COM0–COM3), supporting 1/2 or 1/3 bias and 2/3/4 duty configurations. Its integrated LCD controller eliminates external driver ICs in applications like appliance control panels - reducing bill-of-materials cost and PCB area. Segment outputs are shared with P0–P2 port pins, allowing flexible allocation between display and general I/O in the M38D24G4FP#U0.

What is the role of the OSCSEL pin on the M38D24G4FP#U0?

The OSCSEL pin on the M38D24G4FP#U0 selects the active main clock source at reset and wake-up: high level enables external resonator (XIN/XOUT), low level enables the on-chip oscillator. This pin is specific to QzROM versions like the M38D24G4FP#U0 - flash variants use CNVSS instead. OSCSEL must be externally biased; floating states may cause unpredictable startup behavior in the M38D24G4FP#U0.

Can the M38D24G4FP#U0 perform analog-to-digital conversion while in low-power mode?

Yes, the M38D24G4FP#U0 supports A/D conversion in low-speed mode using the sub-clock (32.768 kHz) as the ADC clock source. Its 10-bit × 8-channel converter operates with reduced sampling rate but maintains accuracy down to 2.0 V VCC - enabling continuous temperature monitoring in battery-powered devices. This capability is confirmed in the M38D24G4FP#U0 datasheet section "A/D converter can be operated in low-speed mode."