Renesas R5F21112DFP#U0

Overview

R5F21112DFP#U0 from Renesas Electronics is a 16-bit CMOS microcontroller in the R8C/11 Group, built on the R8C/Tiny Series CPU core and packaged in a 32-pin LQFP (PLQP0032GB-A). It features 8 KB Flash memory, 512 bytes RAM, a 10-bit 12-channel A/D converter, three 8-bit timers (X/Y/Z), one 16-bit Timer C, dual UART interfaces, and operates across –40°C to +85°C for industrial-grade embedded control in sensor and security systems.

For engineers reviewing the R5F21112DFP#U0 datasheet, R5F21112DFP#U0 pinout, R5F21112DFP#U0 application, or R5F21112DFP#U0 equivalent, key selection criteria include its extended temperature range (–40°C to +85°C), integrated LED drive ports (P10–P17), on-chip high-speed oscillator with frequency adjustment, and dual serial interface support (UART + clock-synchronous serial I/O) for compact appliance and housing equipment designs.

Technical Context

The R5F21112DFP#U0 implements the R8C/Tiny CPU core with 89 basic instructions and executes at 50 ns minimum instruction time (20 MHz XIN, VCC = 3.0–5.5 V). Its memory map provides 1 Mbyte address space, with Flash ROM mapped from 0C000₁₆ to 0FFFF₁₆ and RAM from 00400₁₆ to 005FF₁₆, supporting subroutine calls and interrupt stacks in internal RAM.

Peripheral integration includes two independent UART channels (RxD0/TxD0 and RxD1/TxD10/TxD11), a 10-bit A/D converter with 12 analog inputs (AN0–AN11), voltage detection circuitry, watchdog timer (15-bit with prescaler), and oscillation stop detection - all managed via dedicated Special Function Registers (SFRs) located in the 00000₁₆–002FF₁₆ address range.

Key Specifications

Pinout & Package

Package: 32-pin plastic LQFP (PLQP0032GB-A / 32P6U-A), 7 mm × 7 mm, 0.8 mm pitch, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21112DFP#U0, the R5F21113DFP#U0 and R5F21114DFP#U0 offer scalable Flash/RAM while preserving identical I/O, timing, and thermal performance - enabling drop-in upgrades without PCB or firmware architecture changes.

Availability

R5F21112DFP#U0 is available at Aetrix Electronics and suitable for smart home sensor hubs, industrial panel controllers, and housing automation nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for R5F21112DFP#U0 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 automotive, industrial, and IoT markets.

The R8C/11 Group targets cost-sensitive, low-power embedded control applications in appliances, housing equipment, and industrial sensors - emphasizing integration, reliability, and ease of migration within the R8C/Tiny family.

FAQ

What is the maximum operating frequency supported by the R5F21112DFP#U0?

The R5F21112DFP#U0 supports a maximum main clock frequency of 20 MHz when powered at 3.0–5.5 V, delivering a minimum instruction execution time of 50 ns. At lower supply voltages (2.7–5.5 V), the maximum clock is 10 MHz with 100 ns instruction timing. The on-chip high-speed oscillator can be adjusted to meet precise timing requirements without external crystals.

Does the R5F21112DFP#U0 support in-circuit debugging?

Yes, the R5F21112DFP#U0 supports on-chip debugging via the dedicated debug interface. However, pins P00/AN7/TxD11 and P37/TxD10/RxD1 must not be used for application I/O during debug sessions, as they are repurposed for debug communication. Full debug functionality requires Renesas E8/E8a emulator hardware and associated software tools.

How many analog input channels does the R5F21112DFP#U0 A/D converter have?

The R5F21112DFP#U0 integrates a single 10-bit successive-approximation A/D converter with 12 analog input channels (AN0 through AN11). These channels are multiplexed across port pins P00–P07 and P10–P13, and configuration is controlled via the ADPC register to select active analog inputs prior to conversion.

What is the purpose of the MODE pin on the R5F21112DFP#U0?

The MODE pin on the R5F21112DFP#U0 determines the boot vector location at power-on or reset. When held high, the device boots from the standard Flash memory vector table (0FFDC₁₆). When pulled low, it selects an alternate vector location - typically used for bootloader implementations or factory programming modes. It must be externally biased with a pull-up or pull-down resistor.

Can the R5F21112DFP#U0 operate from a 3.3 V supply?

Yes, the R5F21112DFP#U0 operates reliably from a 3.3 V supply across its full temperature range (–40°C to +85°C). At 3.0–5.5 V, it supports up to 10 MHz operation; at 3.3 V specifically, typical current consumption is 5 mA (active) and 35 µA (Wait mode), making it well-suited for battery-backed or energy-efficient embedded systems.