Renesas UPD78F0740MA-FAA-AX

Overview

UPD78F0740MA-FAA-AX from Renesas Electronics is an 8-bit CMOS microcontroller in the 78K0/IY2 family, featuring 64 KB on-chip Flash memory, 4 KB RAM, and a 20 MHz max CPU clock. It integrates 16-bit timers (X0/X1), 8-bit timer H1, watchdog timer, 10-bit ADC (8 channels), UART, I²C, and 32-pin LQFP package. It targets industrial control panels requiring deterministic real-time response and low-power operation.

For engineers reviewing the UPD78F0740MA-FAA-AX datasheet, UPD78F0740MA-FAA-AX pinout, UPD78F0740MA-FAA-AX application, or UPD78F0740MA-FAA-AX equivalent, key selection criteria include Flash endurance (100k write/erase cycles), internal high-speed oscillator accuracy (±1%), ADC sampling rate (up to 100 kSPS), and support for single-cycle instruction execution at 20 MHz.

Technical Context

The UPD78F0740MA-FAA-AX implements the 78K0 CPU core with 16-bit address space and 8-bit data path, supporting 131 instructions including bit manipulation and conditional branching. Its clock system includes selectable sources: external crystal (1–20 MHz), internal high-speed oscillator (20 MHz ±1%), internal low-speed oscillator (15 kHz), and PLL for frequency multiplication.

Peripheral integration follows the 78K0/IY2 architecture: dual 16-bit timers with PWM and event capture, one 16-bit timer/event counter (TM00), three 8-bit timers (T51, TH1, T30), 10-bit SAR ADC with hardware trigger synchronization, and serial interfaces (UART0/1, I²C bus interface) all mapped to dedicated SFRs with interrupt vectoring.

Key Specifications

Pinout & Package

UPD78F0740MA-FAA-AX is housed in a 32-pin LQFP (7 mm × 7 mm, 0.8 mm pitch) package with exposed thermal pad. Pin functions are defined per Renesas User's Manual Rev.5.00 (Feb 2012), Section 1.3.1 and 2.1.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0740MA-FAA-AX, R5F100PLAFB#30 offers modern RL78 architecture and LIN support but requires toolchain migration, while UPD78F0730MC-8EU-A provides identical peripheral behavior and pin compatibility at lower cost - ideal for derivative designs with unchanged firmware size constraints.

Availability

UPD78F0740MA-FAA-AX is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, home appliance UIs, and PLC I/O modules requiring stable component supply across multi-year production cycles.

Supply support for UPD78F0740MA-FAA-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 headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The UPD78F0740MA-FAA-AX belongs to the 78K0/IY2 product line - designed specifically for cost-sensitive, real-time embedded control applications demanding high reliability, low power, and mature toolchain support in industrial and consumer equipment.

FAQ

What is the maximum operating frequency of the UPD78F0740MA-FAA-AX?

The UPD78F0740MA-FAA-AX supports a maximum CPU clock frequency of 20 MHz, achievable using either the internal high-speed oscillator (±1% accuracy) or an external crystal up to 20 MHz. At this speed, most instructions execute in a single cycle (200 ns), enabling tight real-time loop timing for motor control and sensor processing tasks.

Does the UPD78F0740MA-FAA-AX include on-chip debug capability?

Yes, the UPD78F0740MA-FAA-AX supports single-wire on-chip debugging via the QB-MINI2 emulator and RA78K0 toolchain. This allows full register visibility, breakpoint insertion, and real-time variable monitoring without requiring additional debug pins or external JTAG hardware - critical for rapid firmware validation in industrial environments.

How many ADC channels does the UPD78F0740MA-FAA-AX support, and what is its resolution?

The UPD78F0740MA-FAA-AX integrates a 10-bit successive approximation register (SAR) ADC with 8 input channels (AN0–AN7), accessible through Port 2 pins. It supports hardware-triggered conversion (e.g., by timer overflow) and delivers 1024 discrete levels with typical INL of ±1 LSB - sufficient for precision temperature, pressure, and current sensing.

Is the UPD78F0740MA-FAA-AX pin-compatible with other 78K0/IY2 devices?

Yes, the UPD78F0740MA-FAA-AX shares the same 32-pin LQFP package and pinout with other 78K0/IY2 members including UPD78F0741 and UPD78F0742. This allows hardware reuse across variants differing only in Flash/RAM size or peripheral enablement - simplifying PCB design and inventory management for families of related products.

What low-power modes are supported by the UPD78F0740MA-FAA-AX?

The UPD78F0740MA-FAA-AX supports three low-power modes: HALT (CPU stopped, peripherals active), STOP (CPU and most peripherals halted, RAM retained), and IDLE (CPU clock gated, selected peripherals running). In STOP mode, typical current consumption is under 1 μA - enabling battery-operated applications with extended standby periods while retaining full register and RAM state.