Renesas UPD78F9211GR(A)-JJG-A

Overview

UPD78F9211GR(A)-JJG-A from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0S/KY1+ family, featuring 64 KB on-chip Flash memory, 4 KB RAM, a 16-bit timer array unit (TAU), and integrated UART/SIO/CSI interfaces. It operates at up to 20 MHz with supply voltage range 2.7–5.5 V and targets embedded control in industrial appliances and office equipment.

For engineers reviewing the UPD78F9211GR(A)-JJG-A datasheet, UPD78F9211GR(A)-JJG-A pinout, UPD78F9211GR(A)-JJG-A application, or UPD78F9211GR(A)-JJG-A equivalent, key selection criteria include Flash endurance (100k write/erase cycles), built-in low-voltage detection (LVD), and support for I²C-compatible serial interface - all confirmed in the U16994EJ6V0UD User's Manual.

Technical Context

The UPD78F9211GR(A)-JJG-A implements the 78K0S CPU core with 16-bit ALU, supports both ROM-based and RAM-based program execution, and integrates a 16-bit timer array unit (TAU) with input capture, output compare, PWM generation, and interval timer functions. Its clock system includes main, sub, and on-chip oscillator options with selectable prescalers.

It features 52 I/O pins across Ports 2–4, with programmable pull-up resistors, CMOS-level input thresholds, and individual port direction control via Pn and PMn registers. The device supports 12 interrupt sources including external INT pins, timer overflows, and serial interface events - all vectored and prioritized in hardware.

Key Specifications

Pinout & Package

UPD78F9211GR(A)-JJG-A is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignment follows the μPD78F921x standard layout defined in Chapter 1.3.1 of U16994EJ6V0UD.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F100PLAFB#30 and UPD78F9212GR(A)-JJG-A, the UPD78F9211GR(A)-JJG-A delivers proven stability in mature appliance platforms, maintains full software compatibility within the 78K0S/KY1+ family, and supports legacy toolchains (RA78K0S/CC78K0S) without migration overhead.

Availability

UPD78F9211GR(A)-JJG-A is available at Aetrix Electronics and suitable for home appliance control, industrial sensor interface, and office equipment power management requiring stable component supply and long-term production continuity.

Supply support for UPD78F9211GR(A)-JJG-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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions for industrial, automotive, and consumer markets.

The 78K0S/KY1+ product line - including UPD78F9211GR(A)-JJG-A - was designed for cost-sensitive, high-volume embedded control applications demanding robust Flash reliability, low-power operation, and seamless integration with legacy 8-bit development ecosystems.

FAQ

What is the maximum operating frequency of the UPD78F9211GR(A)-JJG-A?

The UPD78F9211GR(A)-JJG-A supports a maximum system clock frequency of 20 MHz when using the main system oscillator (X1/X2). This is achieved with external crystal or ceramic resonator configurations; internal high-speed oscillator options are limited to 8 MHz. All timing-critical peripherals - including the TAU and serial interfaces - scale linearly with this clock, and electrical specifications in Chapter 19 of U16994EJ6V0UD confirm stable operation up to 20 MHz across the full 2.7–5.5 V supply range.

Does the UPD78F9211GR(A)-JJG-A include an on-chip debug interface?

Yes, the UPD78F9211GR(A)-JJG-A supports on-chip debugging via the single-wire debug (SWD) interface compatible with QB-MINI2 and ID78K0S-QB tools. Debug access requires no dedicated pins - it shares P10 (TxD) and P11 (RxD) in debug mode, preserving all other I/O functionality during normal operation. The UPD78F9211GR(A)-JJG-A implements full breakpoint, watchpoint, and register inspection capabilities as documented in the RA78K0S Assembler Package manual (U17391E).

What Flash memory technology is used in the UPD78F9211GR(A)-JJG-A?

The UPD78F9211GR(A)-JJG-A uses SuperFlash® technology licensed from Silicon Storage Technology, Inc., delivering 64 KB of on-chip program memory with guaranteed 100,000 write/erase cycles and 10-year data retention at 85°C. This Flash architecture enables page-erase and byte-write operations, supports in-application programming (IAP), and includes hardware lock bits to prevent unauthorized firmware modification - all verified in the electrical characteristics section (Chapter 20) of the UPD78F9211GR(A)-JJG-A User's Manual U16994EJ6V0UD.

Can the UPD78F9211GR(A)-JJG-A operate from a 3.3 V supply?

Yes, the UPD78F9211GR(A)-JJG-A is fully specified to operate across 2.7 V to 5.5 V, making it compatible with standard 3.3 V logic systems without level shifters. At 3.3 V, it maintains full functionality including 20 MHz operation (with appropriate external clock source), all I/O drive strength (±20 mA), and accurate LVD trip point selection. Electrical test data in Table 19-1 of U16994EJ6V0UD confirms parameter compliance across the entire voltage range, including current consumption and timing margins.

Is the UPD78F9211GR(A)-JJG-A pin-compatible with other devices in the 78K0S/KY1+ family?

The UPD78F9211GR(A)-JJG-A shares identical pin configuration and package (64-pin LQFP) with μPD78F9210(A) and μPD78F9212(A) variants, enabling direct PCB reuse across the 78F921x series. However, functional differences exist - for example, UPD78F9210(A) has only 48 KB Flash and lacks one UART channel present in UPD78F9211GR(A)-JJG-A. Pin compatibility is explicitly confirmed in Section 1.3.1 "μPD78F921x Pin Configuration" of U16994EJ6V0UD, but firmware and peripheral initialization must be validated per device variant.