Renesas UPD78F0454GB(S)-UEU-AT

Overview

UPD78F0454GB(S)-UEU-AT from Renesas Electronics is a 16-bit CMOS microcontroller in the 78K0/Dx2 family, featuring 64 KB on-chip Flash memory, 4 KB RAM, and integrated LCD controller with up to 128-segment drive capability. It operates at up to 20 MHz, supports 5V operation, and includes 10-bit ADC (8 channels), UART, I²C, and 16-bit timer arrays - deployed in industrial control panels and appliance user interfaces.

For engineers reviewing the UPD78F0454GB(S)-UEU-AT datasheet, UPD78F0454GB(S)-UEU-AT pinout, UPD78F0454GB(S)-UEU-AT application, or UPD78F0454GB(S)-UEU-AT equivalent, key selection criteria include segment drive count, Flash endurance (100k write/erase cycles), operating voltage range (2.7–5.5 V), and support for low-power STOP mode with RTC wake-up.

Technical Context

The UPD78F0454GB(S)-UEU-AT implements the 78K0 CPU core with 16-bit architecture, Harvard memory organization, and instruction set compatible with earlier 78K0 devices. It integrates an on-chip voltage regulator (REGC pin), programmable LCD bias generator, and segmented LCD driver supporting static, 1/2, 1/3, or 1/4 duty with 1/2 or 1/3 bias.

Peripheral integration includes a 10-bit A/D converter with sample-and-hold, three 16-bit timer arrays (each with capture/compare/PWM functions), serial interface (UART/I²C), and 22-channel interrupt capability. The device uses a single 5 V supply and supports four power-saving modes: HALT, STOP, IDLE, and sub-idle.

Key Specifications

Pinout & Package

This device is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are defined per Renesas Hardware User's Manual Rev.3.00 (Oct 2010), Section 1.4 and Chapter 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F104PJAFB#30, UPD78F0454GB(S)-UEU-AT delivers integrated LCD driving and higher Flash density; versus UPD78F0532GA-GAM-AX, it trades memory capacity for cost-sensitive designs where 64 KB suffices and BOM reduction is critical.

Availability

UPD78F0454GB(S)-UEU-AT is available at Aetrix Electronics and suitable for industrial HMI panels, home appliance control units, medical device displays, and building automation terminals requiring stable component supply across long-lifecycle production programs.

Supply support for UPD78F0454GB(S)-UEU-AT 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The 78K0/Dx2 product line targets cost-sensitive, low-to-mid complexity embedded applications requiring integrated peripherals, robust LCD support, and long-term supply stability - especially in white goods and industrial control.

FAQ

What is the maximum operating frequency of the UPD78F0454GB(S)-UEU-AT?

The UPD78F0454GB(S)-UEU-AT supports a maximum system clock frequency of 20 MHz, achievable using either an external crystal oscillator (up to 20 MHz) or the internal high-speed oscillator (HOC) calibrated to ±1% accuracy at 20 MHz. This frequency enables real-time execution of control loops and LCD refresh at 60 Hz without CPU resource contention. The UPD78F0454GB(S)-UEU-AT maintains full peripheral functionality-including ADC conversion, UART transmission, and timer PWM generation-at this speed.

Does the UPD78F0454GB(S)-UEU-AT support in-circuit debugging?

Yes, the UPD78F0454GB(S)-UEU-AT supports on-chip debugging via the single-wire debug interface (SWD) using Renesas' QB-MINI2 emulator. Debug features include real-time register inspection, breakpoint setting, step execution, and memory read/write access without halting peripheral operation. The UPD78F0454GB(S)-UEU-AT reserves dedicated debug pins (BKGD and RESET) that do not conflict with standard I/O functions, enabling non-intrusive development and field firmware validation.

What LCD configurations does the UPD78F0454GB(S)-UEU-AT support?

The UPD78F0454GB(S)-UEU-AT supports static, 1/2, 1/3, and 1/4 duty drive modes with 1/2 or 1/3 bias voltage generation - configurable via LCD control registers (LCDCR0–LCDCR2). It drives up to 128 segments using 4 commons (COM0–COM3) and 32 segment outputs (SEG0–SEG31), accommodating custom alphanumeric or icon-based displays. The UPD78F0454GB(S)-UEU-AT includes automatic frame rate control and blink function without CPU intervention.

Is the UPD78F0454GB(S)-UEU-AT RoHS compliant?

Yes, the UPD78F0454GB(S)-UEU-AT is RoHS compliant and meets the EU Directive 2011/65/EU requirements for restriction of hazardous substances. Renesas confirms lead-free termination (matte tin plating), absence of Cd, Pb, Hg, Cr⁶⁺, PBB, and PBDE, and compliance with JEDEC J-STD-020 moisture sensitivity level (MSL) 3. The UPD78F0454GB(S)-UEU-AT packaging and marking follow Renesas' environmental compliance documentation (e.g., "RoHS Compliant" label on reel and datasheet).

What power supply configuration is required for the UPD78F0454GB(S)-UEU-AT?

The UPD78F0454GB(S)-UEU-AT requires two independent 5 V supplies: VDD (core and peripheral logic) and EVDD (I/O ports and LCD segment drivers), both referenced to their respective ground planes (VSS and EVSS). An external 1 µF capacitor must be connected between REGC and VSS to stabilize the internal 3.3 V regulator. The UPD78F0454GB(S)-UEU-AT operates across 2.7–5.5 V, but full 5 V operation ensures optimal noise margin and LCD contrast performance.