Renesas UPD78F8055GC(R)-UEU-AX

Overview

UPD78F8055GC(R)-UEU-AX from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/LG3-M family, featuring 128 KB on-chip Flash memory, 8 KB RAM, and integrated LCD controller supporting up to 160 segments. It operates at up to 20 MHz with a 2.7–5.5 V supply and targets embedded control in industrial HMI and metering applications requiring low-power segment driving.

For engineers reviewing the UPD78F8055GC(R)-UEU-AX datasheet, UPD78F8055GC(R)-UEU-AX pinout, UPD78F8055GC(R)-UEU-AX application, or UPD78F8055GC(R)-UEU-AX equivalent, key selection criteria include confirmed LCD segment drive capability (160 seg × 4 com), Flash endurance (100k write/erase cycles), and package-specific pin mapping for the 100-pin LQFP (PLQP0100KB-A).

Technical Context

The UPD78F8055GC(R)-UEU-AX implements the 78K0S CPU core with 16-bit address space and supports both internal high-speed oscillator (20 MHz) and external crystal (1–20 MHz). Its peripheral set includes 12-bit ADC (16 channels), 16-bit timer arrays (TAU), UART/SIO, I²C-compatible serial interface, and dedicated LCD voltage booster circuitry enabling direct 3V/5V segment bias without external components.

It integrates a programmable low-voltage detection (LVD) circuit with 4 selectable thresholds (2.45/2.75/3.05/3.35 V), real-time clock (RTC) with calendar function, and on-chip debug interface compliant with IEEE 1149.1 JTAG. Memory protection is enforced via Flash lock bits and register write-protection mechanisms.

Key Specifications

Pinout & Package

This device is housed in a 100-pin LQFP (PLQP0100KB-A) package with 0.5 mm pitch, 14 mm × 14 mm body size, and exposed thermal pad for enhanced heat dissipation in industrial environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F100LEAFB#30 and UPD78F8054GC(R)-UEU-AX, the UPD78F8055GC(R)-UEU-AX uniquely balances high Flash density (128 KB) with full-featured integrated LCD driving-enabling compact, component-count-optimized designs where display integration is mandatory and firmware scalability is critical.

Availability

UPD78F8055GC(R)-UEU-AX is available at Aetrix Electronics and suitable for industrial panel meters, smart energy meters, and building automation thermostats requiring stable component supply across multi-year production cycles.

Supply support for UPD78F8055GC(R)-UEU-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, and power devices for industrial, automotive, and IoT applications.

The 78K0/LG3-M product line was designed specifically for cost-sensitive, display-intensive embedded systems requiring high integration of LCD control, analog measurement, and real-time operation in harsh industrial environments.

FAQ

What is the maximum segment count supported by the UPD78F8055GC(R)-UEU-AX LCD controller?

The UPD78F8055GC(R)-UEU-AX supports up to 160 LCD segments with 4 commons, configurable for static, 1/2, or 1/4 duty drive. This is implemented via dedicated SEG0–SEG159 and COM0–COM3 pins, and verified in the 78K0/Lx3-M Hardware User's Manual Rev.2.00 Section 1.4.2 and Section 2.2.25. The UPD78F8055GC(R)-UEU-AX does not support dynamic expansion beyond this fixed hardware limit.

Does the UPD78F8055GC(R)-UEU-AX include an on-chip voltage booster for LCD bias generation?

Yes, the UPD78F8055GC(R)-UEU-AX integrates a programmable charge pump that generates LCD bias voltages of 3×VDD or 4×VDD without external components. This feature is documented in Section 1.1 "Features" and Section 2.2.25 "SEGxx" of the 78K0/Lx3-M Hardware User's Manual Rev.2.00. The UPD78F8055GC(R)-UEU-AX uses this booster to drive segments directly at required voltage margins under varying supply conditions.

What is the Flash memory endurance specification for the UPD78F8055GC(R)-UEU-AX?

The UPD78F8055GC(R)-UEU-AX guarantees 100,000 write/erase cycles for its 128 KB on-chip Flash memory, with data retention of 10 years at 85°C. This specification is stated in the 78K0/Lx3-M Hardware User's Manual Rev.2.00 Section 1.1 and confirmed in Renesas' Flash reliability documentation. Firmware update routines in the UPD78F8055GC(R)-UEU-AX must respect this endurance limit to ensure long-term field reliability.

Which package type corresponds to the UPD78F8055GC(R)-UEU-AX orderable part number?

The UPD78F8055GC(R)-UEU-AX is supplied in a 100-pin LQFP package designated PLQP0100KB-A, with 0.5 mm pitch and 14 mm × 14 mm body size. This is explicitly defined in the "Ordering Information" section (1.3) and "Pin Configuration" section (1.4.2) of the 78K0/Lx3-M Hardware User's Manual Rev.2.00. The UPD78F8055GC(R)-UEU-AX has no alternate package variants under this specific suffix.

Does the UPD78F8055GC(R)-UEU-AX support JTAG-based debugging and boundary-scan testing?

Yes, the UPD78F8055GC(R)-UEU-AX implements a full IEEE 1149.1-compliant JTAG interface with TDI, TDO, TCK, TMS, and TRST pins assigned to P10–P14. This enables boundary-scan testing, real-time trace, and full-featured on-chip debugging. The capability is detailed in Section 2.2.21 "IC" and Section 4.3 of the 78K0/Lx3-M Hardware User's Manual Rev.2.00. Debug access to the UPD78F8055GC(R)-UEU-AX requires Renesas E1/E20 emulators or compatible third-party tools.