Renesas UPD78F0034AGC-8BS-A

Overview

UPD78F0034AGC-8BS-A from Renesas Electronics is an 8-bit flash-based microcontroller in the 78K/0 Series, designed for embedded control in resource-constrained systems. It integrates 32 KB on-chip flash ROM, 1024 bytes of high-speed RAM, a 10-bit 8-channel A/D converter (AVDD = 2.7–5.5 V), three serial interfaces (two 3-wire + one UART), and five timer channels. It operates across 1.8–5.5 V supply and supports industrial temperature range (–40 to +85°C), targeting cost-sensitive consumer and office automation applications.

For engineers reviewing the UPD78F0034AGC-8BS-A datasheet, UPD78F0034AGC-8BS-A pinout, UPD78F0034AGC-8BS-A application, or UPD78F0034AGC-8BS-A equivalent, key selection criteria include its 64-pin LQFP package, 51 I/O pins (including four 5-V-tolerant N-ch open-drain outputs), minimum instruction cycle of 0.24 µs at 8.38 MHz, external memory expansion capability (64 KB), and dual power domain (VDD0/VDD1, VSS0/VSS1) for noise-sensitive analog/digital partitioning.

Technical Context

The UPD78F0034AGC-8BS-A implements the 78K/0 CPU core with 16-bit arithmetic, BCD adjustment, and bit-manipulation instructions. Its peripheral set includes a 16-bit timer/event counter (TM0) with capture/compare, two 8-bit timers (TM50/TM51) supporting PWM output, a watchdog timer, and a watch timer - all synchronized to either main (8.38 MHz crystal) or subsystem (32.768 kHz crystal) clock domains.

It features dual voltage domains: VDD0/VSS0 powers ports and digital logic, while VDD1/VSS1 supplies internal circuitry; AVDD/AVSS/AVREF provide dedicated analog supply and reference for the 10-bit A/D converter. The serial interface supports time-division UART (1 channel) and synchronous 3-wire I/O (2 channels), with dedicated pins for SI/SO/SCK per channel and independent ASCK0 for asynchronous operation.

Key Specifications

Pinout & Package

UPD78F0034AGC-8BS-A is housed in a 64-pin plastic LQFP (12 × 12 mm, 0.5 mm pitch), compliant with JEDEC MO-220. The package supports fine-pitch PCB assembly and provides dedicated analog/digital power and ground pins (AVDD/AVSS, VDD0/VDD1, VSS0/VSS1) for noise-sensitive mixed-signal operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0034AGC-8BS-A, UPD78F0033GK-8A8 offers reduced flash (24 KB vs. 32 KB) at identical package and peripheral compatibility, while UPD78F0032GC-AB8 trades both memory capacity and package footprint (QFP vs. LQFP) - making the UPD78F0034AGC-8BS-A optimal for new designs requiring maximum on-chip code space in compact 12×12 mm LQFP.

Availability

UPD78F0034AGC-8BS-A is available at Aetrix Electronics and suitable for home appliance control, office automation devices, car audio front panels, and industrial sensor nodes requiring stable component supply throughout product lifecycles.

Supply support for UPD78F0034AGC-8BS-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 specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and IoT applications.

The UPD78F0034AGC-8BS-A belongs to the 78K/0 Series - a family of 8-bit MCUs engineered for cost-effective, low-power embedded control in consumer electronics, office equipment, and industrial systems where integration, reliability, and long-term supply stability are essential.

FAQ

What is the maximum operating frequency of the UPD78F0034AGC-8BS-A?

The UPD78F0034AGC-8BS-A supports a maximum main system clock frequency of 8.38 MHz using an external crystal on X1/X2. At this frequency, its minimum instruction execution time is 0.24 µs. The subsystem clock runs at 32.768 kHz for low-power timing functions. Operation beyond these frequencies is not guaranteed and may violate timing specifications in the official Renesas datasheet U12300EJ1V0DS00.

Does the UPD78F0034AGC-8BS-A support in-system programming (ISP)?

Yes, the UPD78F0034AGC-8BS-A supports in-system programming via its on-chip flash memory. Renesas provides dedicated programming tools including the E8 emulator and Flash Development Toolkit (FDT), enabling firmware updates without removing the UPD78F0034AGC-8BS-A from the target board. Programming requires specific voltage sequencing and protocol compliance as defined in the UPD78F0034AGC-8BS-A hardware manual.

How many analog input channels does the UPD78F0034AGC-8BS-A have, and what is their voltage range?

The UPD78F0034AGC-8BS-A integrates a 10-bit successive-approximation A/D converter with eight single-ended analog input channels (ANI0–ANI7) mapped to P10–P17. The analog supply AVDD supports 2.7 V to 5.5 V, and the A/D conversion range is referenced to AVDD and AVSS - meaning full-scale input is 0 V to AVDD. AVREF can be used for precise external reference if needed.

What are the power supply requirements for the UPD78F0034AGC-8BS-A's analog and digital sections?

The UPD78F0034AGC-8BS-A requires two independent digital supply domains: VDD0/VSS0 for I/O ports and VDD1/VSS1 for internal logic, plus a dedicated analog domain (AVDD/AVSS/AVREF). All supplies must be decoupled locally. VDD0 and VDD1 accept 1.8–5.5 V; AVDD must match VDD0 or VDD1 potential. Separating VSS0 and VSS1 is recommended to minimize digital noise coupling into the A/D converter.

Is the UPD78F0034AGC-8BS-A pin-compatible with other members of the µPD78003x family?

Yes, the UPD78F0034AGC-8BS-A shares identical pinout and package (64-pin LQFP) with UPD78F0031, UPD78F0032, and UPD78F0033 in the same GK-8A8 suffix variant. All share the same peripheral register map and memory architecture - enabling hardware compatibility across the subseries, with differentiation limited to flash size (8–32 KB) and RAM capacity (512–1024 bytes).