Renesas UPD78F9212CS-CAB-A

Overview

UPD78F9212CS-CAB-A from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0S/KY1+ family, featuring 128 KB on-chip Flash memory, 8 KB RAM, and a 20 MHz max CPU clock. It integrates UART, I²C, 16-bit timer/counters, and 10-bit ADC with 16 channels. It targets industrial control panels requiring deterministic real-time response and low-power operation.

For engineers reviewing the UPD78F9212CS-CAB-A datasheet, UPD78F9212CS-CAB-A pinout, UPD78F9212CS-CAB-A application, or UPD78F9212CS-CAB-A equivalent, key selection criteria include Flash endurance (100k write/erase cycles), operating voltage range (2.7–5.5 V), package type (LQFP-100), and peripheral compatibility with legacy 78K0S designs.

Technical Context

The UPD78F9212CS-CAB-A implements the 78K0S CPU core with 16-bit addressing and 8-bit ALU, supporting 131 instructions including bit manipulation and multi-byte arithmetic. It uses SuperFlash® technology for program memory, enabling single-cycle read access and background operation during programming.

Clock generation includes a main system oscillator (1–20 MHz crystal), sub-oscillator (32.768 kHz), and on-chip PLL for internal clock multiplication. Reset sources comprise power-on reset, watchdog timer, and external reset pin - all mapped to dedicated SFR bits for software-controlled recovery.

Key Specifications

Pinout & Package

LQFP-100 (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F100LGSP and UPD78F9234GC-GAD-AX, the UPD78F9212CS-CAB-A offers optimal balance of Flash capacity, analog integration, and legacy-compatible clock architecture - making it ideal for cost-sensitive industrial upgrades where existing PCB layout and crystal-based timing must be preserved.

Availability

UPD78F9212CS-CAB-A is available at Aetrix Electronics and suitable for industrial HMI panels, building automation controllers, and programmable logic relays requiring stable component supply and long-term lifecycle support.

Supply support for UPD78F9212CS-CAB-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 UPD78F9212CS-CAB-A belongs to the 78K0S/KY1+ 8-bit MCUs product line, designed specifically for cost-optimized, real-time control applications in industrial equipment where reliability, peripheral richness, and toolchain continuity are critical.

FAQ

What is the maximum operating frequency of the UPD78F9212CS-CAB-A?

The UPD78F9212CS-CAB-A supports a maximum CPU clock frequency of 20 MHz. This is achieved using the on-chip PLL with external crystal input (1–20 MHz on X1/X2), allowing full-speed execution without external clock generators. The UPD78F9212CS-CAB-A maintains stable operation across its specified voltage range (2.7–5.5 V) and industrial temperature range (−40°C to +85°C).

Does the UPD78F9212CS-CAB-A support in-circuit debugging?

Yes, the UPD78F9212CS-CAB-A includes a dedicated on-chip debug interface compatible with Renesas QB-MINI2 and ID78K0S-QB emulators. It supports full breakpoint control, register inspection, and real-time memory access without requiring external debug headers. The UPD78F9212CS-CAB-A debug interface operates independently of user code execution and remains functional even when Flash security is enabled.

What packaging and pin count does the UPD78F9212CS-CAB-A use?

The UPD78F9212CS-CAB-A is supplied in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. This package provides 64 general-purpose I/O pins, 16 dedicated ADC inputs, and full peripheral signal routing - matching the pinout of other 78K0S/KY1+ variants like UPD78F9210 and UPD78F9211 for hardware compatibility. The UPD78F9212CS-CAB-A package meets JEDEC standard MS-026 and RoHS requirements.

How many ADC channels does the UPD78F9212CS-CAB-A support, and what is its resolution?

The UPD78F9212CS-CAB-A integrates a 10-bit successive-approximation ADC with 16 input channels (AN0–AN15), accessible via Port 4 and alternate function pins. Conversion time is 1.2 µs per sample with internal 2.5 V or external VDD reference selection. The UPD78F9212CS-CAB-A ADC includes built-in offset calibration and supports scan mode for automatic sequential conversion across multiple channels.

Is the UPD78F9212CS-CAB-A pin-compatible with other members of the 78K0S/KY1+ family?

Yes, the UPD78F9212CS-CAB-A shares identical pin assignment and electrical characteristics with UPD78F9210CS-CAB-A and UPD78F9211CS-CAB-A in the same LQFP-100 package. All three devices support the same peripheral mapping, reset behavior, and power sequencing - enabling firmware reuse and hardware design scalability. The UPD78F9212CS-CAB-A differs only in Flash (128 KB) and RAM (8 KB) capacity, not in pin functionality or timing.