Renesas R5F21355CNFP#X6

Overview

R5F21355CNFP#X6 from Renesas Electronics is a 16-bit R8C CPU core MCU with 24 KB flash program memory, 2 KB data flash (4 × 1 KB blocks), and 2 KB RAM, operating at up to 20 MHz (VCC = 2.7–5.5 V) for real-time control in consumer appliance motor drives and industrial sensor interfaces.

For engineers reviewing the R5F21355CNFP#X6 datasheet, R5F21355CNFP#X6 pinout, R5F21355CNFP#X6 application, or R5F21355CNFP#X6 equivalent, key selection criteria include its 52-pin LQFP package, integrated LIN hardware module (using Timer RA + UART0), 10-bit × 12-channel ADC with sweep mode, dual 8-bit DAC outputs, and background operation (BGO) support for data flash reprogramming during runtime.

Technical Context

The R5F21355CNFP#X6 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. Its memory map spans 1 Mbyte (00000h–FFFFFh), with fixed interrupt vector table at 0FFDCh–0FFFFh and data flash at 03000h–03FFFh.

It integrates four independent clock sources - XIN (up to 20 MHz), XCIN (32 kHz), high-speed on-chip oscillator (adjustable), and low-speed on-chip oscillator - with selectable frequency dividers (1/2/4/8/16) and oscillation stop detection. Power modes include standard, wait (3.5 µA @ 3.0 V, f(XCIN)=32 kHz), and stop (2.0 µA).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21355CNFP#X6, R5F21356CNFP offers greater program space for feature-rich firmware, while R5F21355CDFP provides extended temperature reliability-neither is pin-compatible with non-R8C/35C family devices, and both retain identical peripheral register mapping and instruction set compatibility.

Availability

R5F21355CNFP#X6 is available at Aetrix Electronics and suitable for home appliance motor control, industrial sensor interface, consumer audio system monitoring, and office equipment power management requiring stable component supply across long-lifecycle production programs.

Supply support for R5F21355CNFP#X6 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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The R8C/35C Group, including R5F21355CNFP#X6, was designed for cost-sensitive, low-power embedded control in consumer electronics and industrial equipment where integration of timers, ADC, DAC, LIN, and flash flexibility reduces system component count.

FAQ

What is the maximum operating frequency and supply voltage range for the R5F21355CNFP#X6?

The R5F21355CNFP#X6 operates at up to 20 MHz when supplied with 2.7–5.5 V, and supports reduced-frequency operation down to 5 MHz at 1.8–5.5 V for ultra-low-voltage applications. Its minimum instruction execution time is 50 ns under full-speed conditions, enabling deterministic real-time response in motor control loops and sensor sampling routines. The device maintains full peripheral functionality across this voltage range.

Does the R5F21355CNFP#X6 support hardware LIN communication, and how is it implemented?

Yes, the R5F21355CNFP#X6 includes a dedicated hardware LIN module compliant with LIN 2.0/2.1 standards, implemented using Timer RA for baud rate timing and UART0 for serial framing. This eliminates the need for external LIN transceivers in slave-node applications and ensures precise bit timing without CPU overhead. The LIN function is enabled via SFR configuration and shares no pins with other primary UART channels.

How does the background operation (BGO) function work in the R5F21355CNFP#X6 data flash?

The R5F21355CNFP#X6 supports background operation (BGO) for its 4 KB data flash (1 KB × 4 blocks), allowing flash erase/write operations to proceed concurrently with program execution from main ROM. BGO is controlled via the FMRDYIF flag and FMRDYIC register, enabling seamless firmware updates, parameter storage, or calibration data logging without halting real-time tasks-a critical capability for uninterrupted operation in appliance and industrial controllers.

What are the low-power consumption figures for R5F21355CNFP#X6 in wait and stop modes?

In wait mode with the 32 kHz XCIN clock active, the R5F21355CNFP#X6 consumes 3.5 µA at 3.0 V; in stop mode, consumption drops to 2.0 µA under the same conditions. These values assume all peripherals except the low-speed oscillator and voltage monitor are disabled. The device retains RAM content and wake-up capability via INTx or key input interrupts, making it suitable for battery-backed applications like remote sensors or standby controllers.

Can the R5F21355CNFP#X6 generate three-phase PWM waveforms, and which timer supports this?

Yes, the R5F21355CNFP#X6 can generate synchronized three-phase PWM waveforms using Timer RD, which provides two independent 16-bit timer channels (RD0 and RD1), each with four capture/compare registers and six output pins. Its "reset synchronous PWM mode" and "complementary PWM mode" support dead-time insertion, phase-shifted outputs, and triangular/sawtooth modulation-essential for driving inverter stages in BLDC and PMSM motor control applications without external PWM generators.