Renesas UPD78F1142AF1-AN1-A

Overview

UPD78F1142AF1-AN1-A from Renesas Electronics is a 16-bit single-chip microcontroller in the 78K0R/KE3 family, featuring 128 KB on-chip Flash memory, 8 KB RAM, and integrated peripherals including 10-bit ADC (8 channels), UART, I²C, and timer modules. It operates at up to 20 MHz with supply voltage range of 2.7 V to 5.5 V and targets embedded control in industrial sensors and motor drive interfaces.

For engineers reviewing the UPD78F1142AF1-AN1-A datasheet, UPD78F1142AF1-AN1-A pinout, UPD78F1142AF1-AN1-A application, or UPD78F1142AF1-AN1-A equivalent, key selection criteria include Flash endurance (100,000 write/erase cycles), operating temperature range (−40°C to +85°C), and support for on-chip debug via single-wire interface - all critical for cost-sensitive, long-lifecycle industrial firmware deployments.

Technical Context

The UPD78F1142AF1-AN1-A implements the 78K0R CPU core with 16-bit architecture, Harvard memory organization, and instruction set compatible with earlier 78K0 devices. It integrates a programmable low-voltage detector (LVD), watchdog timer (WDT), and power-on reset (POR) circuitry for robust system initialization.

Peripherals include a 16-bit multifunction timer array (MTU) with PWM output capability, a serial interface (CSI) supporting SPI-like operation, and an on-chip voltage regulator (REGC pin) enabling single-supply operation. The device supports in-system programming (ISP) via on-chip bootloader using UART or CSI.

Key Specifications

Pinout & Package

The UPD78F1142AF1-AN1-A is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad for enhanced thermal dissipation in continuous industrial operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with UPD78F1142AF1-AN1-A, R5F100PLAFB#30 reduces memory and power integration but lowers unit cost, while UPD78F1144AF1-AN1-A provides direct pin-compatible headroom for feature expansion - both require no layout change but differ in Flash scalability and analog peripheral depth.

Availability

UPD78F1142AF1-AN1-A is available at Aetrix Electronics and suitable for industrial sensor nodes, brushless DC motor controllers, and programmable logic relays requiring stable component supply and long-term production continuity.

Supply support for UPD78F1142AF1-AN1-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 infrastructure markets.

The 78K0R/KE3 product line delivers cost-optimized 16-bit MCUs targeting resource-constrained industrial control applications where reliability, Flash endurance, and debug accessibility outweigh raw performance demands.

FAQ

What is the maximum operating frequency of the UPD78F1142AF1-AN1-A?

The UPD78F1142AF1-AN1-A supports a maximum system clock frequency of 20 MHz when using the on-chip PLL with an external crystal oscillator. Without PLL, the maximum frequency is 16 MHz using the main system clock directly. This timing specification is validated across the full −40°C to +85°C operating temperature range and ensures deterministic instruction execution for real-time control loops in the UPD78F1142AF1-AN1-A.

Does the UPD78F1142AF1-AN1-A support in-system programming (ISP)?

Yes, the UPD78F1142AF1-AN1-A supports in-system programming via its built-in bootloader, accessible through UART or CSI interfaces. The bootloader occupies fixed Flash space and allows firmware updates without removing the UPD78F1142AF1-AN1-A from the target board. Programming requires no external high-voltage signals and is compatible with standard 3.3 V level shifters, making field upgrades practical for deployed UPD78F1142AF1-AN1-A units.

What debug interface does the UPD78F1142AF1-AN1-A provide?

The UPD78F1142AF1-AN1-A features a single-wire background debugger (BKGD) interface compliant with Renesas' standard debug protocol. This interface enables full read/write access to memory and registers, hardware breakpoints, and real-time variable monitoring using tools like ID78K0R-QB. No JTAG header or additional pins are required - the BKGD pin serves dual purpose as debug port and general-purpose I/O when not in debug mode on the UPD78F1142AF1-AN1-A.

Is the UPD78F1142AF1-AN1-A qualified for industrial temperature operation?

Yes, the UPD78F1142AF1-AN1-A is fully qualified for industrial temperature operation from −40°C to +85°C. This rating is confirmed in the official Renesas Electrical Characteristics table and applies to all specified DC and AC parameters, including Flash write/erase endurance, ADC accuracy, and timer jitter. The qualification covers the entire 100-pin LQFP package variant UPD78F1142AF1-AN1-A without derating.

What is the role of the REGC pin on the UPD78F1142AF1-AN1-A?

The REGC pin on the UPD78F1142AF1-AN1-A connects to an external 1.0 µF ceramic capacitor to stabilize the internal voltage regulator that supplies the CPU core and on-chip peripherals at 3.3 V. This enables single-supply operation from 2.7 V to 5.5 V without requiring an external 3.3 V rail. The REGC function is active only when the internal regulator is enabled via the system control register - a key power architecture feature of the UPD78F1142AF1-AN1-A.