Renesas UPD78F0034AGK-9ET-A

Overview

UPD78F0034AGK-9ET-A from Renesas Electronics is a flash-memory-based 8-bit single-chip microcontroller in the 78K/0 Series, featuring 32 Kbytes of on-chip program memory, 10-bit 8-channel A/D converter, three serial interface channels (including UART), and operation down to 1.8 V. It serves as a system controller in low-voltage embedded applications such as home appliance control panels and office automation peripherals.

For engineers reviewing the UPD78F0034AGK-9ET-A datasheet, UPD78F0034AGK-9ET-A pinout, UPD78F0034AGK-9ET-A application, or UPD78F0034AGK-9ET-A equivalent, key selection criteria include its 51 I/O capability, 1.8–5.5 V supply range, 64-pin LQFP package, integrated A/D with AVDD=2.7–5.5 V support, and compatibility with 78K/0 instruction set architecture.

Technical Context

The UPD78F0034AGK-9ET-A implements the 78K/0 CPU core with 8-bit data bus width and 16-bit address space extension, supporting external memory expansion up to 64 Kbytes via multiplexed AD0–AD7 and dedicated A8–A15 address lines. Its peripheral set includes one 16-bit timer/event counter, two 8-bit timer/event counters, one watch timer, and one watchdog timer - all synchronized to either main (8.38 MHz) or subsystem (32.768 kHz) clock domains.

Serial communication is implemented across three independent channels: two 3-wire synchronous interfaces (SI30/SO30/SCK30 and SI31/SO31/SCK31) and one full-duplex UART (RxD0/TxD0/ASCK0). The A/D converter operates with internal reference or external AVREF input and supports software- or hardware-triggered conversion using ADTRG on P03.

Key Specifications

Pinout & Package

UPD78F0034AGK-9ET-A is housed in a 64-pin plastic LQFP (12 × 12 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Renesas Preliminary Data Sheet U12300EJ1V0DS00, with dual power/ground domains (VDD0/VSS0 for ports, VDD1/VSS1 for core/analog) and separate analog supply (AVDD/AVSS/AVREF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0034AGK-9ET-A, the QFP variant offers mechanical robustness in high-vibration environments, while the RL78/G13 delivers architectural upgrades including DMA-assisted A/D transfers and LIN compliance - both require layout changes but address distinct reliability and roadmap needs.

Availability

UPD78F0034AGK-9ET-A is available at Aetrix Electronics and suitable for home appliance control, office automation peripherals, car audio front panels, and industrial HMI modules requiring stable component supply across multi-year production cycles.

Supply support for UPD78F0034AGK-9ET-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 connectivity solutions for industrial, automotive, and enterprise applications.

The UPD78F0034AGK-9ET-A belongs to the 78K/0 Series - a family of cost-optimized 8-bit MCUs designed for resource-constrained embedded control in consumer and industrial equipment where low voltage, integrated A/D, and serial interface flexibility are essential.

FAQ

What is the maximum operating frequency of the UPD78F0034AGK-9ET-A?

The UPD78F0034AGK-9ET-A achieves a minimum instruction execution time of 0.24 µs when operating at 8.38 MHz main system clock frequency. This corresponds to a maximum effective instruction throughput of approximately 4.17 million instructions per second (MIPS), confirmed in Renesas Preliminary Data Sheet U12300EJ1V0DS00 Section 5. Function Overview. The subsystem clock runs at 32.768 kHz for low-power timing functions.

Does the UPD78F0034AGK-9ET-A support external memory expansion?

Yes, the UPD78F0034AGK-9ET-A supports external memory expansion up to 64 Kbytes using its multiplexed AD0–AD7 address/data bus and dedicated A8–A15 address lines. Control signals RD, WR, WAIT, and ASTB are provided on P64–P67 to interface directly with standard SRAM or EPROM devices, as detailed in Section 7 of the U12300EJ1V0DS00 datasheet.

What are the analog supply requirements for the A/D converter in the UPD78F0034AGK-9ET-A?

The UPD78F0034AGK-9ET-A requires AVDD = 2.7 to 5.5 V, AVSS tied to VSS0, and AVREF referenced to either internal AVDD or an external precision voltage source. These connections are mandatory for valid 10-bit A/D conversion across all eight channels (ANI0–ANI7), as specified in Section 5.5 "A/D Converter" of the U12300EJ1V0DS00 datasheet.

How many interrupt sources does the UPD78F0034AGK-9ET-A support?

The UPD78F0034AGK-9ET-A supports 19 total interrupt sources: 13 internal (including timer overflows, A/D completion, serial receive) and 5 external (INTP0–INTP3 plus ADTRG on P03). All interrupts are vectored and maskable except for one non-maskable internal source, as documented in Section 6 "Interrupt Functions" of the U12300EJ1V0DS00 datasheet.

Is the UPD78F0034AGK-9ET-A pin-compatible with other members of the µPD78003x subseries?

Yes, the UPD78F0034AGK-9ET-A shares identical pinout and electrical characteristics with µPD780031, µPD780032, and µPD780033 in the same LQFP package (GK suffix), differing only in internal ROM size and RAM capacity. This allows hardware reuse across variants during prototyping and production scaling, as confirmed in the Ordering Information table of U12300EJ1V0DS00.