Renesas UPD78F0103M5MC(A)-5A4-A

Overview

UPD78F0103M5MC(A)-5A4-A from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K/0 series, featuring 8 KB mask ROM, 512 bytes RAM, and 32 bytes buffer RAM. It operates from 1.8 V to 5.5 V, delivers 53 I/O ports (including 4 N-channel open-drain), and integrates an 8-channel 8-bit A/D converter and dual serial interfaces. It targets low-voltage embedded control in consumer audio and home appliances.

For engineers reviewing the UPD78F0103M5MC(A)-5A4-A datasheet, UPD78F0103M5MC(A)-5A4-A pinout, UPD78F0103M5MC(A)-5A4-A application, or UPD78F0103M5MC(A)-5A4-A equivalent, key selection considerations include its 64-pin LQFP package, 1.8 V minimum supply, on-chip 16-bit timer/event counter, and support for external memory expansion up to 64 KB.

Technical Context

This microcontroller implements the 78K/0 CPU core with instruction set supporting 8-bit × 8-bit multiplication, 16-bit ÷ 8-bit division, BCD correction, and bit manipulation. Its clock system supports dual oscillators: main system clock (X1/X2) and subsystem clock (XT1/XT2), enabling flexible low-power operation down to 32.768 kHz.

The peripheral set includes five timer channels (one 16-bit, two 8-bit, one watch timer, one watchdog timer), programmable clock output (PCL), buzzer output (BUZ), and two serial interfaces - one configurable as 3-wire SIO/SBI and another as 3-wire auto-transmit/receive mode with up to 32-byte internal buffer.

Key Specifications

Pinout & Package

UPD78F0103M5MC(A)-5A4-A is housed in a 64-pin plastic LQFP (12 × 12 mm) package with 0.5 mm pitch. Pin functions are fully defined per Renesas datasheet U10280EJ2V1DS00, including dedicated analog inputs (ANI0–ANI7), serial interface signals (SI0/SO0/SCK0, SI1/SO1/SCK1), and external memory control (RD/WR/ASTB/WAIT).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0103M5MC(A)-5A4-A, the UPD78F0104 variant offers double ROM capacity for enhanced feature sets without layout changes, while the UPD78F0102 provides a lower-cost entry point for minimal firmware-both retain identical I/O count, A/D, timers, and 64-pin LQFP compatibility.

Availability

UPD78F0103M5MC(A)-5A4-A is available at Aetrix Electronics and suitable for consumer audio equipment, home appliance control, and portable camera modules requiring stable component supply across long-lifecycle production runs.

Supply support for UPD78F0103M5MC(A)-5A4-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, and power solutions for industrial, automotive, and consumer markets.

The UPD78F0103M5MC(A)-5A4-A belongs to the 78K/0 series - a family of low-voltage, cost-optimized 8-bit MCUs designed for battery-powered and space-constrained embedded control applications in consumer electronics.

FAQ

What is the maximum operating frequency of the UPD78F0103M5MC(A)-5A4-A?

The UPD78F0103M5MC(A)-5A4-A supports a maximum main system clock frequency of 10.0 MHz via the X1/X2 crystal oscillator. At this frequency, its minimum instruction execution time is 0.4 µs. The subsystem clock operates at 32.768 kHz for low-power timing functions. The UPD78F0103M5MC(A)-5A4-A does not support PLL-based frequency multiplication beyond the crystal input.

Does the UPD78F0103M5MC(A)-5A4-A support in-circuit debugging?

The UPD78F0103M5MC(A)-5A4-A does not integrate a dedicated on-chip debug interface such as JTAG or SWD. Debugging relies on external tools compatible with the 78K/0 series, including Renesas E8 emulator and MINICUBE2, which connect via dedicated debug pins (not shared with user I/O). The UPD78F0103M5MC(A)-5A4-A requires specific emulator firmware and the µPD78018F User's Manual (U10659E) for setup.

Can the UPD78F0103M5MC(A)-5A4-A operate from a single 3.3 V supply?

Yes, the UPD78F0103M5MC(A)-5A4-A operates fully within a 3.3 V supply (within its 1.8 V to 5.5 V range). All I/Os are 3.3 V tolerant when VDD = 3.3 V, and the A/D converter reference (AVREF) can be tied to VDD or an external source. The UPD78F0103M5MC(A)-5A4-A maintains full functionality-including 53 I/O, 8-channel A/D, and dual serial interfaces-at 3.3 V without derating.

What is the function of the ASTB pin on the UPD78F0103M5MC(A)-5A4-A?

The ASTB (Address Strobe) pin on the UPD78F0103M5MC(A)-5A4-A is an active-high output used during external memory access to latch address information from port 4 (AD0–AD7) and port 5 (A8–A15). It synchronizes external memory devices by indicating valid address setup time. The UPD78F0103M5MC(A)-5A4-A asserts ASTB before RD or WR, enabling external latches or peripherals to capture the multiplexed address/data bus correctly.

Is the UPD78F0103M5MC(A)-5A4-A RoHS compliant?

Yes, the UPD78F0103M5MC(A)-5A4-A is RoHS compliant per EU Directive 2011/65/EU. Renesas confirms lead-free finish and absence of restricted substances including lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE. Compliance is documented in Renesas' environmental reports and applies to the LQFP package configuration specified in the part number suffix -5A4-A.