Renesas R5F21113FP#U0

Overview

R5F21113FP#U0 from Renesas Electronics is a 16-bit Flash microcontroller in the R8C/11 Group, built on the R8C/Tiny Series CPU core and packaged in a 32-pin LQFP (PLQP0032GB-A). It delivers 50 ns minimum instruction execution at 20 MHz, integrates 12 KB Flash memory and 768 bytes RAM, and supports 22 I/O pins including LED drive capability - deployed in household appliances, office equipment, and sensor-based housing systems.

For engineers reviewing the R5F21113FP#U0 datasheet, R5F21113FP#U0 pinout, R5F21113FP#U0 application, or R5F21113FP#U0 equivalent, key selection criteria include its 10-bit 12-channel ADC, dual UART interfaces (one clock-synchronous), three 8-bit timers plus one 16-bit timer with input capture/output compare, on-chip high-speed/low-speed oscillators, and -20°C to +85°C operating range.

Technical Context

The R5F21113FP#U0 implements the R8C/Tiny CPU core with 89 basic instructions and a 1-Mbyte address space. Its memory map allocates fixed interrupt vectors at 0FFDC–0FFFF₁₆, internal ROM starting at 0C000₁₆ (for 12 KB), and internal RAM from 00400₁₆. Two register banks support context switching, and the FLG register provides 11 status flags including IPL (3-bit priority level) and U flag for stack pointer selection.

Peripheral control relies on Special Function Registers (SFRs) mapped to 00000–002FF₁₆, including WDTS, CM0/CM1 for clock control, HR0/HR1 for high-speed on-chip oscillator tuning, and dedicated interrupt control registers (e.g., INT0IC, ADIC, S0TIC) enabling granular enable/disable per source. The watchdog timer is 15-bit with prescaler, and voltage detection circuitry supports reset and interrupt generation.

Key Specifications

Pinout & Package

Package: 32-pin plastic molded LQFP (PLQP0032GB-A, JEDEC MS-026AC variant), 7 mm × 7 mm body, 0.8 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21113FP#U0, R5F21114FP#U0 offers headroom for feature-rich firmware while R5F21112FP#U0 reduces bill-of-materials cost for minimal implementations - all share identical pinout, peripherals, and package, enabling drop-in scalability within the R8C/11 family.

Availability

R5F21113FP#U0 is available at Aetrix Electronics and suitable for home appliance control, office equipment HMI, and housing security sensor nodes requiring stable component supply across extended production lifecycles.

Supply support for R5F21113FP#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 consumer markets.

The R8C/11 Group targets cost-sensitive, low-to-mid complexity embedded control applications - designed for reliability in household, office, and building automation systems with integrated analog and communication peripherals.

FAQ

What is the maximum operating frequency supported by the R5F21113FP#U0?

The R5F21113FP#U0 supports a maximum external clock frequency of 20 MHz at VCC = 3.0–5.5 V, achieving a minimum instruction execution time of 50 ns. When operated at 10 MHz (VCC = 2.7–5.5 V), the minimum instruction time is 100 ns. The on-chip high-speed oscillator can be tuned but does not exceed 20 MHz specification.

Does the R5F21113FP#U0 support in-circuit debugging?

Yes, the R5F21113FP#U0 supports on-chip debugging via dedicated pins (P00/AN7/TxD11 and P37/TxD10/RxD1), though these pins must be unused during debug session. Renesas' E8 emulator and associated toolchain provide full breakpoint, watchpoint, and memory inspection capabilities for the R8C/Tiny core.

How many analog input channels does the R5F21113FP#U0 ADC support?

The R5F21113FP#U0 integrates a single 10-bit successive-approximation A/D converter with 12 analog input channels (AN0–AN11), mapped across P00–P07 and P10–P13. Channel selection is software-controlled via the ADPC register, and conversion results are stored in the ADRES register.

What are the power supply requirements for the analog section of the R5F21113FP#U0?

The R5F21113FP#U0 requires separate analog power connections: AVCC and AVSS. AVCC must be connected to VCC (2.7–5.5 V) and decoupled to AVSS with a 0.1 µF capacitor. AVSS must connect directly to VSS. This isolation ensures <±1 LSB integral nonlinearity in ADC measurements under typical noise conditions.

Is the R5F21113FP#U0 pin-compatible with other members of the R8C/11 Group?

Yes, all R8C/11 Group devices in the FP package (PLQP0032GB-A), including R5F21112FP#U0, R5F21113FP#U0, and R5F21114FP#U0, share identical pin assignments, electrical characteristics, and peripheral register maps - enabling hardware reuse across memory variants without PCB changes.