Renesas R5F21355DNFP#V0

Overview

R5F21355DNFP from Renesas is a 16-bit R8C CPU core microcontroller with 24 KB flash memory, 1 KB RAM, 52-pin LQFP package, and operating temperature range of –20°C to +85°C. It integrates UART0/UART2 (with I²C mode), 10-bit 12-channel ADC, four 8-/16-bit timers, watchdog timer, voltage detection, and on-chip oscillators - designed for cost-sensitive embedded control in consumer appliances and office equipment.

For engineers reviewing the R5F21355DNFP datasheet, R5F21355DNFP pinout, R5F21355DNFP application, or R5F21355DNFP equivalent, key selection considerations include its 24 KB flash capacity, 52-pin PLQP0052JA-A footprint, support for 20 MHz operation at 2.7–5.5 V, real-time clock (Timer RE), and integrated I²C-capable UART2 for sensor and peripheral interfacing.

Technical Context

The R5F21355DNFP implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit hardware multiplier, and 20-bit address space (1 Mbyte). It executes instructions in as little as 50 ns at 20 MHz (VCC = 2.7–5.5 V) and supports single-chip mode only.

Its peripheral set includes Timer RC (16-bit with 4 capture/compare registers and 3-PWM output), UART2 with full I²C-bus compliance (SCL2/SDA2), and A/D converter with sample-and-hold and sweep mode - all mapped to dedicated SFRs and configurable I/O pins including P0–P6 ports with programmable pull-up resistors.

Key Specifications

Pinout & Package

Package: 52-pin LQFP (PLQP0052JA-A), 10 mm × 10 mm body, 0.65 mm pitch, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21355DNFP, the R5F21356DNFP offers 33% more flash for complex feature sets, while the R5F21355DDFP extends operational reliability to –40°C - both retain identical peripheral functionality and 52-pin LQFP compatibility, enabling drop-in upgrades where thermal or memory headroom is constrained.

Availability

R5F21355DNFP is available at Aetrix Electronics and suitable for home appliance control, office equipment motor drive, and audio system front panel applications requiring stable component supply and long-term production continuity.

Supply support for R5F21355DNFP 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 is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and consumer markets.

The R8C/35D Group, including R5F21355DNFP, was engineered for cost-optimized, low-power embedded control in consumer electronics - emphasizing integration of timers, communication interfaces, and analog functions to minimize external component count.

FAQ

What is the maximum operating frequency and supply voltage range for R5F21355DNFP?

The R5F21355DNFP operates at up to 20 MHz when supplied with 2.7–5.5 V, and supports reduced-speed operation at 5 MHz down to 1.8 V. Its minimum instruction execution time is 50 ns under 20 MHz/2.7–5.5 V conditions, enabling responsive real-time control in appliance and office equipment applications.

Does R5F21355DNFP support I²C communication natively?

Yes, R5F21355DNFP supports full I²C-bus communication through UART2 configured in I²C mode, using dedicated SCL2 and SDA2 pins (P3_4 and P3_5). This capability is documented in the R8C/35D Group datasheet section 1.1.2 and requires no external transceiver for standard 100/400 kHz sensor interfacing.

What is the function of the TREO pin on R5F21355DNFP?

The TREO pin (P6_0 and P0_4) serves as the output for Timer RE - the 8-bit real-time clock module. It provides divided clock signals for timekeeping (seconds/minutes/hours/days-of-week) and can generate periodic interrupts or external timing pulses, enabling low-power calendar functions without external RTC hardware.

How much internal RAM and flash memory does R5F21355DNFP include?

R5F21355DNFP integrates 1 KB of internal RAM for data storage and stack operations, and 24 KB of on-chip flash memory for program code and constants. This configuration is confirmed in Table 1.3 (Product List) of the R8C/35D Group datasheet and supports typical firmware footprints for mid-complexity consumer control applications.

Is R5F21355DNFP pin-compatible with other members of the R8C/35D Group?

Yes, R5F21355DNFP shares the identical 52-pin LQFP (PLQP0052JA-A) package and pin assignment with all R8C/35D Group variants including R5F21354DNFP and R5F21356DNFP. Pin functions, peripheral mappings, and electrical characteristics are consistent across the group, allowing hardware reuse across memory-size variants.