Renesas M3455AGCHFP#U0

Overview

M3455AGCHFP#U0 from Renesas Electronics is a 4-bit CMOS single-chip microcomputer with integrated LCD controller (32 segments × 4 commons), three timers (two 8-bit, one 16-bit), watchdog timer, voltage drop detection (reset at 1.7 V), and key-on wakeup on 24 pins. It operates from 1.8 to 5.5 V and supports ceramic resonator, quartz crystal (32.768 kHz), and on-chip oscillators - deployed in infrared remote control transmitters.

For engineers reviewing the M3455AGCHFP#U0 datasheet, M3455AGCHFP#U0 pinout, M3455AGCHFP#U0 application, or M3455AGCHFP#U0 equivalent, this page delivers verified functional identity, confirmed 52-pin LQFP package mapping, validated I/O and LCD pin roles, real-time power mode current specs (5 µA clock operating mode), and two documented alternative parts for remote-control MCU selection.

Technical Context

The M3455AGCHFP#U0 implements the 4500 Series CPU core with 138 basic instructions and 0.5 µs minimum instruction execution time at 6 MHz high-speed through mode. Its system clock is configurable via MR register across 16 modes - including f(XIN), f(XCIN), f(HSOCO), and f(LSOCO) sources with programmable division ratios (×1, ÷2, ÷4, ÷8).

It integrates a dedicated LCD drive control circuit supporting 1/2 or 1/3 bias and 2/3/4 duty, with internal resistor options (r = 100 kΩ typ.) and segment/common outputs mapped directly to port pins. The voltage drop detection circuit features independent enable via VDCE pin and three threshold levels (reset at 1.7 V, release at 1.8 V, skip at 2.0 V).

Key Specifications

Pinout & Package

Package: 52-pin plastic LQFP (PLQP0052JA-A), 10 mm × 10 mm, 0.65 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit microcontroller applications.

Compared with M3455AG8FP, the M3455AGCHFP#U0 offers 50% more ROM for protocol expansion while maintaining identical power, LCD, and wakeup behavior; versus uPD78F0503GC-8EU-AX, it delivers lower system cost and simpler design for dedicated remote control, despite lower computational capability.

Availability

M3455AGCHFP#U0 is available at Aetrix Electronics and suitable for infrared remote control transmitters, handheld medical devices, consumer appliance keypads, and industrial status display panels requiring stable component supply and long-term lifecycle support.

Supply support for M3455AGCHFP#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, power, and SoC solutions for automotive, industrial, and consumer markets.

The 455A Group - including M3455AGCHFP#U0 - was designed specifically for ultra-low-power, cost-sensitive remote control and simple HMI applications, emphasizing integrated LCD drive, multi-source clocking, and robust key-scan wakeup.

FAQ

What is the ROM size of the M3455AGCHFP#U0 and how does it impact firmware development?

The M3455AGCHFP#U0 contains 12288 words × 10 bits of ROM, providing 15.0 KB of addressable program space. This capacity supports full implementation of multiple IR protocols (NEC, RC-5, Sony), button debouncing logic, LCD refresh routines, and low-power state management - giving developers headroom for field-upgradable features without requiring external memory. The M3455AGCHFP#U0 ROM is mask-programmed during fabrication and cannot be reprogrammed in-circuit.

Does the M3455AGCHFP#U0 support external crystal oscillation, and what frequency range is valid?

Yes, the M3455AGCHFP#U0 supports external quartz crystal oscillation via XCIN/XCOUT pins at 32.768 kHz only. This sub-clock source is used for low-power timing functions such as real-time clock emulation and sleep-mode wakeups. The main system clock (XIN/XOUT) accepts ceramic resonators from 4 to 6 MHz - the M3455AGCHFP#U0 does not support higher-frequency crystals on either oscillator input.

How many LCD segments and commons can the M3455AGCHFP#U0 drive, and what bias/duty configurations are supported?

The M3455AGCHFP#U0 drives up to 32 segments and 4 commons, supporting 1/2 bias with 2-duty, 1/3 bias with 3-duty, or 1/3 bias with 4-duty configurations. Segment outputs map directly to P00–P33 and SEG0–SEG31 pins; common outputs are COM0–COM3. Internal resistors (100 kΩ typ.) enable static or multiplexed LCD drive without external components - the M3455AGCHFP#U0 does not support 1/4 bias or >4-common operation.

What is the function of the VDCE pin on the M3455AGCHFP#U0, and how should it be used in a battery-powered design?

The VDCE (Voltage Drop Detection Enable) pin is an active-high digital input that enables or disables the internal voltage monitor. In battery-powered designs, tie VDCE to VDD to activate reset (1.7 V) and skip (2.0 V) functions during voltage sag; pull VDCE low to disable monitoring entirely - useful during battery charging or brown-out recovery sequences. Leaving VDCE floating is prohibited. The M3455AGCHFP#U0 requires explicit VDCE control to ensure predictable low-voltage behavior.

Can the M3455AGCHFP#U0 generate a 38 kHz IR carrier signal without external components, and which timer is used?

Yes, the M3455AGCHFP#U0 generates precise 38 kHz IR carrier signals using Timer 2, an 8-bit timer with dual reload registers and built-in carrier wave generation circuit. Timer 2's auto-reload and output control eliminate firmware interrupt overhead - the carrier waveform appears directly on the CNTR pin (shared with Port C). No external oscillator or gate logic is needed, making the M3455AGCHFP#U0 suitable for compact, low-BOM IR transmitter designs.