Renesas UPD78F9478GC-8BT-A

Overview

UPD78F9478GC-8BT-A from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K/0S Series, featuring 128 KB on-chip flash memory, 8 KB RAM, and integrated peripherals including 10-bit ADC, UART, I²C, and timer arrays. It operates at up to 20 MHz with supply voltage range 2.7–5.5 V and targets embedded control in industrial and consumer systems requiring deterministic real-time response.

For engineers reviewing the UPD78F9478GC-8BT-A datasheet, UPD78F9478GC-8BT-A pinout, UPD78F9478GC-8BT-A application, or UPD78F9478GC-8BT-A equivalent, key selection criteria include flash endurance (100,000 write/erase cycles), operating temperature range (−40°C to +85°C), and compatibility with RA78K0S assembler and CC78K0S C compiler toolchains.

Technical Context

The UPD78F9478GC-88BT-A implements the 78K/0S CPU core with 16-bit address space, supporting both mask ROM and flash variants within the μPD789479 Subseries. It integrates a 10-bit, 27-channel ADC with programmable sampling time and conversion trigger sources including timer overflows and external pins.

Peripheral configuration includes four 16-bit timer arrays (each with capture/compare/PWM capability), two UART channels with LIN support, one I²C interface with multimaster capability, and a watchdog timer with independent clock source. All peripherals are memory-mapped and controlled via dedicated SFRs with interrupt vectoring.

Key Specifications

Pinout & Package

UPD78F9478GC-8BT-A is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions include 80 general-purpose I/O lines distributed across Ports 0–8, dual UART TX/RX, I²C SDA/SCL, ADC analog inputs (AN0–AN26), and dedicated reset, clock, and power pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F9478GC-8BT-A, R5F100PLGFB#30 offers superior energy efficiency but reduced peripheral density, while STM8L152R8T6 adds security features at the expense of analog integration-making UPD78F9478GC-8BT-A optimal for cost-sensitive, analog-rich industrial control where LIN interoperability matters.

Availability

UPD78F9478GC-8BT-A is available at Aetrix Electronics and suitable for industrial motor control, smart appliance HMI, building automation nodes, and portable medical diagnostic equipment requiring stable component supply and long-term lifecycle support.

Supply support for UPD78F9478GC-8BT-A 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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions.

The UPD78F9478GC-8BT-A belongs to the 78K/0S microcontroller family designed for cost-effective, real-time embedded control in industrial, consumer, and automotive body electronics applications.

FAQ

What is the maximum operating frequency of the UPD78F9478GC-8BT-A?

The UPD78F9478GC-8BT-A supports a maximum system clock frequency of 20 MHz, achievable either via its internal high-speed oscillator or an external crystal connected to X1/X2 pins. This enables 20 MIPS instruction throughput, sufficient for real-time control tasks such as motor commutation and sensor fusion at sub-millisecond intervals. The UPD78F9478GC-8BT-A maintains timing accuracy across its full −40°C to +85°C operating range.

Does the UPD78F9478GC-8BT-A support in-system programming (ISP)?

Yes, the UPD78F9478GC-8BT-A supports in-system programming via its on-chip flash memory and dedicated serial interface (using P00/P01 pins in bootloader mode). Programming requires the PG-FP4 Flash Memory Programmer or compatible Renesas development tools. The UPD78F9478GC-8BT-A allows field firmware updates without removing the device from the PCB, provided VPP is properly managed during programming sequences.

What ADC features does the UPD78F9478GC-8BT-A provide?

The UPD78F9478GC-8BT-A integrates a 10-bit successive approximation ADC with 27 input channels, programmable sampling time, and hardware-triggered conversion using timer overflows or external pins. It supports differential input mode on selected channels and includes built-in offset calibration. The UPD78F9478GC-8BT-A's ADC delivers ±1 LSB INL and DNL across its full operating range, enabling precision sensor interfacing in industrial and medical applications.

Is the UPD78F9478GC-8BT-A pin-compatible with other members of the μPD789479 Subseries?

No, the UPD78F9478GC-8BT-A is not fully pin-compatible with all μPD789479 Subseries members due to variant-specific pin allocations-for example, the UPD78F9479 includes additional CAN interface pins not present on the UPD78F9478GC-8BT-A. While both share the same 100-pin LQFP package and core peripheral set, users must verify pin function mapping against the specific device's User's Manual U15400EJ4V0UD before board reuse.

What development tools are officially supported for the UPD78F9478GC-8BT-A?

Renesas officially supports the RA78K0S Ver.2.00 Assembler Package, CC78K0S Ver.2.00 C Compiler, SM78K Series System Simulator, and IE-78K0S-NS In-Circuit Emulator for the UPD78F9478GC-8BT-A. These tools provide full debugging, simulation, and flash programming capabilities. The UPD78F9478GC-8BT-A is also compatible with the IE-789488-NS-EM1 Emulation Board for hardware-in-the-loop validation.