Renesas R5F21112FP#U0

Overview

R5F21112FP 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 ADC, three 8-bit timers (X/Y/Z), one 16-bit Timer C, dual UART interfaces (one with clock-synchronous capability), and operates from 2.7–5.5 V across –20 to +85 °C. It is used in sensor-based housing equipment and industrial control panels requiring compact, low-power embedded logic.

For engineers reviewing the R5F21112FP datasheet, R5F21112FP pinout, R5F21112FP application, or R5F21112FP equivalent, this page delivers verified technical context, validated pin functions, confirmed peripheral capabilities, and real-world use cases - all aligned to the official R8C/11 Group specification Rev.1.60 (Jan 2006).

Technical Context

The R5F21112FP implements the R8C/Tiny Series 16-bit CPU core with 89 basic instructions and executes at 50 ns minimum instruction time (20 MHz XIN, 3.0–5.5 V) or 100 ns (10 MHz XIN, 2.7–5.5 V). Its memory map spans 1 Mbyte, with ROM starting at 0C000₁₆ and RAM at 00400₁₆, supporting subroutine calls and interrupt stacks in internal RAM.

Peripheral integration includes two independent UART channels (RxD0/TxD0 and RxD1/TxD10/TxD11), an 8-bit LED drive port (P10–P17), on-chip high-speed/low-speed oscillators with frequency adjustment, main clock oscillation stop detection, voltage detection circuit, and power-on reset - all managed via dedicated SFRs such as CM0/CM1, VCR1/VCR2, and OCD.

Key Specifications

Pinout & Package

Package: 32-pin plastic LQFP (PLQP0032GB-A, also designated 32P6U-A), 7 mm × 7 mm, 0.8 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21112FP, R5F21113FP offers headroom for feature-rich firmware while maintaining identical pinout and peripheral timing, whereas R5F21112DFP provides extended temperature qualification without altering functional behavior - enabling drop-in qualification upgrades in harsh environments.

Availability

R5F21112FP is available at Aetrix Electronics and suitable for home appliance control panels, housing security sensor nodes, and office equipment status monitors requiring stable component supply and long-term industrial availability.

Supply support for R5F21112FP 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.

The R8C/11 Group belongs to the R8C/Tiny Series - designed for cost-sensitive, space-constrained embedded applications in consumer and industrial equipment where low power, integrated peripherals, and Flash programmability are essential.

FAQ

What is the maximum operating frequency supported by the R5F21112FP?

The R5F21112FP supports a maximum external clock frequency of 20 MHz on the XIN pin when powered at 3.0–5.5 V, delivering a minimum instruction execution time of 50 ns. At 10 MHz, it operates down to 2.7 V. The on-chip high-speed oscillator can be adjusted but does not exceed 20 MHz nominal output.

Does the R5F21112FP include a hardware debug interface?

The R5F21112FP supports on-chip debugging via dedicated pins (P00/AN7/TxD11 and P37/TxD10/RxD1), but requires Renesas E8 or E8a emulator hardware and associated IDE tools. Pins used for debug cannot simultaneously serve as UART1 or ADC functions during active debugging sessions.

Can the R5F21112FP's ADC measure voltages beyond the VCC rail?

No. The R5F21112FP's 10-bit ADC uses VCC as its reference unless externally supplied VREF is applied to the dedicated VREF pin. With VCC = 5.0 V, the full-scale input range is 0–5.0 V; applying >VCC to any ANx pin risks latch-up and permanent damage.

How many interrupt priority levels does the R5F21112FP support?

The R5F21112FP supports seven programmable interrupt priority levels (0–6), controlled by the 3-bit IPL field in the FLG register. Level 0 is lowest priority and non-maskable; level 6 is highest. Reset and BRK interrupts operate at fixed priority above all user-configurable levels.

Is the R5F21112FP RoHS compliant?

Yes. As documented in Renesas' environmental compliance statements, the R5F21112FP meets EU RoHS Directive requirements. Lead-free LQFP packaging and halogen-free molding compound are standard; full material declarations are available upon request from Renesas sales offices.