Renesas UPD78F0442GB(R)-GAH-AX

Overview

UPD78F0442GB(R)-GAH-AX from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/LE3 family, integrating an LCD controller/driver, 64 KB on-chip Flash memory, 4 KB RAM, and a 10-bit A/D converter. It operates at up to 20 MHz, supports 5V operation, and targets embedded control applications with integrated display interfaces such as industrial panel meters and home appliance UIs.

For engineers reviewing the UPD78F0442GB(R)-GAH-AX datasheet, UPD78F0442GB(R)-GAH-AX pinout, UPD78F0442GB(R)-GAH-AX application, or UPD78F0442GB(R)-GAH-AX equivalent, key selection criteria include its 100-pin LQFP package, built-in LCD segment drive capability (up to 288 segments), Flash endurance (100,000 write/erase cycles), and support for low-power stop modes with RTC wake-up.

Technical Context

The UPD78F0442GB(R)-GAH-AX implements the 78K0 CPU core with 16-bit addressing, supporting 139 instructions and 8-level hardware stack. Its peripheral set includes a 16-bit timer array unit (TAU), serial interface (UART/SIO), I²C-compatible interface, and watchdog timer - all synchronized to the main clock or sub-clock (32.768 kHz).

It features a dedicated LCD controller with internal bias generation, programmable duty cycle (1/2 to 1/8), and static-to-1/8-duty drive capability. The device uses SuperFlash® technology for Flash memory, enabling fast programming and high reliability without external VPP.

Key Specifications

Pinout & Package

UPD78F0442GB(R)-GAH-AX is housed in a 100-pin LQFP package with exposed thermal pad. Pin functions are defined per the 78K0/LE3 family specification, including dedicated LCD segment/common outputs, dual power domains (VDD/VSS for core, AVDD/AVSS for analog), and flexible port mapping.

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 UPD78F0442GB(R)-GAH-AX, R5F100PLGSP#30 offers improved power efficiency but demands layout and firmware changes, while UPD78F0452GB(R)-GAH-AX delivers seamless scalability within the same family - making it the preferred upgrade path for feature expansion without hardware revision.

Availability

UPD78F0442GB(R)-GAH-AX is available at Aetrix Electronics and suitable for industrial panel meters, home appliance UIs, and portable medical diagnostic devices requiring stable component supply and long-term lifecycle support.

Supply support for UPD78F0442GB(R)-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 global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and enterprise applications.

The 78K0/LE3 product line was designed for cost-sensitive, display-integrated embedded systems requiring high reliability, low-power operation, and mature toolchain support - targeting applications where legacy code base retention and long-term supply stability are critical.

FAQ

What is the maximum LCD segment count supported by the UPD78F0442GB(R)-GAH-AX?

The UPD78F0442GB(R)-GAH-AX supports up to 288 LCD segments using its integrated controller - configured as 36 segment outputs (SEG0–SEG35) and 8 common outputs (COM0–COM7). This enables driving alphanumeric displays with icons or bar graphs without external driver ICs. The UPD78F0442GB(R)-GAH-AX's segment mapping and bias generation are fully programmable via SFRs, allowing static, 1/2-, 1/3-, 1/4-, or 1/8-duty operation.

Does the UPD78F0442GB(R)-GAH-AX include an internal voltage regulator?

Yes, the UPD78F0442GB(R)-GAH-AX includes an internal voltage regulator controlled via the REGC pin. When REGC is asserted, the regulator supplies a stable 3.0 V to the core logic, enabling reliable operation from unregulated 4.5–5.5 V inputs. This eliminates the need for an external LDO in many applications. The UPD78F0442GB(R)-GAH-AX datasheet specifies regulator output accuracy as ±3% over temperature and load, with typical quiescent current of 120 µA.

What is the Flash memory endurance and data retention for the UPD78F0442GB(R)-GAH-AX?

The UPD78F0442GB(R)-GAH-AX uses SuperFlash® technology, guaranteeing 100,000 write/erase cycles per sector and 20-year data retention at 85°C. Each Flash sector can be erased independently, supporting robust firmware update schemes. The UPD78F0442GB(R)-GAH-AX also supports secure boot and Flash lock bits to prevent unauthorized readout - critical for certified medical or industrial deployments.

Can the UPD78F0442GB(R)-GAH-AX operate from a 3.3 V supply?

No - the UPD78F0442GB(R)-GAH-AX is specified for 4.5–5.5 V operation only. Its I/O structure, Flash programming voltage, and LCD bias generation are optimized for 5 V. Attempting 3.3 V operation may cause undefined behavior, failed A/D conversions, or incomplete LCD contrast. For 3.3 V systems, consider the RL78/G13-based R5F100PLGSP#30 instead. The UPD78F0442GB(R)-GAH-AX's absolute maximum ratings prohibit VDD below 4.0 V.

Is there hardware support for real-time clock (RTC) functionality in the UPD78F0442GB(R)-GAH-AX?

The UPD78F0442GB(R)-GAH-AX does not integrate a dedicated RTC module, but supports RTC implementation using its 16-bit timer array unit (TAU) with sub-clock (32.768 kHz) input and interrupt-driven calendar logic. The UPD78F0442GB(R)-GAH-AX's TAU can generate accurate 1-second interrupts, retain time across stop modes when powered by the sub-clock domain, and maintain calendar registers in backup RAM - meeting typical RTC accuracy requirements (<±2 ppm) with proper crystal loading.