Renesas UPD78F0451GB(S)-GAH-AX

Overview

UPD78F0451GB(S)-GAH-AX from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/LE3 family, featuring integrated LCD controller/driver, 64 KB on-chip Flash memory, 4 KB RAM, and 29 I/O pins. It operates at up to 20 MHz, supports 10-bit ADC with 12 channels, and targets embedded control applications requiring direct segment-based display driving.

For engineers reviewing the UPD78F0451GB(S)-GAH-AX datasheet, UPD78F0451GB(S)-GAH-AX pinout, UPD78F0451GB(S)-GAH-AX application, or UPD78F0451GB(S)-GAH-AX equivalent, key selection criteria include LCD segment drive capability (up to 288 segments), Flash endurance (100,000 write/erase cycles), operating voltage range (2.7–5.5 V), and industrial temperature grade (−40°C to +85°C).

Technical Context

The UPD78F0451GB(S)-GAH-AX implements the 78K0 CPU core with 16-bit address space, Harvard architecture, and instruction set compatible with earlier 78K0 devices. It integrates a 10-bit successive-approximation ADC with sample-and-hold, programmable gain amplifier input option, and conversion time of 1.2 μs per channel.

Its LCD controller supports static, 2-, 3-, and 4-multiplex drive modes with built-in bias generation, charge pump, and segment/common output drivers capable of driving up to 288 segments. The device includes a real-time counter (RTC), watchdog timer, and 16-bit multi-function timer array with capture/compare/PWM functions.

Key Specifications

Pinout & Package

UPD78F0451GB(S)-GAH-AX is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Renesas User's Manual Rev.2.00 (R01UH0180EJ0200), Section 2.1.3 (78K0/LE3 Pin Function List) and Section 1.4.3 (Pin Configuration).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F100PLAFB#30 and MB95560PFT-G-SAMPLE, the UPD78F0451GB(S)-GAH-AX offers superior LCD segment capacity (288 vs. ≤256), built-in charge pump for flexible bias generation, and proven qualification for industrial temperature operation without derating - making it optimal for cost-sensitive, display-intensive embedded controls where layout reuse is critical.

Availability

UPD78F0451GB(S)-GAH-AX is available at Aetrix Electronics and suitable for industrial panel meters, portable medical devices, home appliance control panels, and smart energy meters requiring stable component supply and long-term manufacturing support.

Supply support for UPD78F0451GB(S)-GAH-AX 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/LE3 product line delivers cost-optimized 8-bit MCUs with integrated LCD controllers for display-centric embedded systems in appliances, instrumentation, and portable equipment.

FAQ

What is the maximum LCD segment count supported by UPD78F0451GB(S)-GAH-AX?

The UPD78F0451GB(S)-GAH-AX supports up to 288 LCD segments using its integrated controller/driver in 4-multiplex mode. This is achieved via configurable COM/SEG pin mapping across multiple I/O ports and internal bias generation circuitry. Segment count scales with multiplex ratio - e.g., 72 segments in static mode, 144 in 2-mux, 216 in 3-mux, and full 288 in 4-mux configuration - all managed in firmware without external components.

Does UPD78F0451GB(S)-GAH-AX include a real-time counter (RTC)?

Yes, the UPD78F0451GB(S)-GAH-AX includes a dedicated real-time counter (RTC) module with calendar function, driven by an external 32.768 kHz crystal or internal sub-clock. It operates independently of the main CPU clock, retains time during STOP mode, and supports alarm interrupts. The RTC registers are accessible via SFRs and require no software polling, enabling low-power timekeeping in battery-operated devices using the UPD78F0451GB(S)-GAH-AX.

What is the Flash memory endurance and data retention specification for UPD78F0451GB(S)-GAH-AX?

The UPD78F0451GB(S)-GAH-AX specifies 100,000 write/erase cycles for its 64 KB on-chip Flash memory and guarantees data retention for 20 years at +85°C or 100 years at +25°C. These values are measured per Renesas standard test conditions and apply to the entire Flash array. The UPD78F0451GB(S)-GAH-AX supports block erase and byte/word programming, enabling robust firmware update schemes and non-volatile parameter storage in field-deployed systems.

Can UPD78F0451GB(S)-GAH-AX operate from a single 3.3 V supply?

Yes, the UPD78F0451GB(S)-GAH-AX operates across a supply voltage range of 2.7 V to 5.5 V, fully supporting 3.3 V nominal operation. At 3.3 V, it achieves up to 16 MHz CPU frequency (derated from 20 MHz at 5 V) while maintaining full functionality of ADC, LCD controller, timers, and I/O. All DC characteristics - including VIH/VIL thresholds and drive strength - are guaranteed across this range, making the UPD78F0451GB(S)-GAH-AX suitable for mixed-voltage designs without level shifters.

Is there hardware support for UART or SPI communication in UPD78F0451GB(S)-GAH-AX?

Yes, the UPD78F0451GB(S)-GAH-AX includes a full-duplex UART channel (with selectable baud rates, framing, and parity) and a 3-wire synchronous serial interface (SSI) compatible with SPI master/slave modes. These peripherals are mapped to dedicated pins (e.g., TXD/RXD on P30/P31; SCK/SDA/CS on P10/P11/P12) and controlled via SFRs. The UPD78F0451GB(S)-GAH-AX supports automatic baud rate detection and multi-processor communication mode, simplifying integration into RS-232, RS-485, or sensor network interfaces.