Renesas R5F21355CNFP#30

Overview

R5F21355CNFP#30 from Renesas Electronics is a 16-bit R8C CPU core microcontroller with 24 KB flash program ROM, 2 KB data flash (4 × 1 KB blocks), and 2 KB RAM, operating at up to 20 MHz (VCC = 2.7–5.5 V). It integrates UART0/1/2, I²C-bus, LIN hardware module, 10-bit × 12-channel ADC, dual 8-bit DACs, and six timer units (RA–RE + RD dual-channel) for motor control and real-time clock functions - deployed in consumer audio equipment and office automation systems.

For engineers reviewing the R5F21355CNFP#30 datasheet, R5F21355CNFP#30 pinout, R5F21355CNFP#30 application, or R5F21355CNFP#30 equivalent, key selection criteria include its 52-pin LQFP package, background operation (BGO) data flash capability, -20°C to +85°C industrial temperature grade, integrated LIN transceiver support via UART0/timer RA, and low-power stop mode (2.0 µA).

Technical Context

The R5F21355CNFP#30 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. Its memory map spans 1 Mbyte address space, with fixed interrupt vector table at 0FFDCh–0FFFFh and data flash at 03000h–03FFFh.

Peripheral integration includes three UART channels (UART0/1/2), one shared SSU/I²C interface, hardware LIN using UART0 and timer RA, 12-channel 10-bit ADC with sample-and-hold and sweep mode, and timer RD supporting complementary PWM for three-phase motor drive with 6-pin output and triangular/sawtooth wave modulation.

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 16-bit MCU applications.

Compared with R5F21355CNFP#30, R5F21356CNFP offers 8 KB more program ROM for feature-rich firmware, while R5F21355CDFP provides guaranteed operation down to -40°C - both retain identical peripheral functionality, BGO, and LIN capability, making them drop-in upgrades where memory or temperature margin is the limiting factor.

Availability

R5F21355CNFP#30 is available at Aetrix Electronics and suitable for consumer audio equipment, office automation devices, and industrial sensor hubs requiring stable component supply across long-lifecycle production programs.

Supply support for R5F21355CNFP#30 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, and power solutions for automotive, industrial, and IoT markets.

The R8C/35C Group, including R5F21355CNFP#30, was designed for cost-sensitive, low-power embedded control in consumer appliances and office equipment - emphasizing integration of motor control timers, communication interfaces, and analog peripherals in a single chip.

FAQ

What is the maximum operating frequency and supply voltage range for the R5F21355CNFP#30?

The R5F21355CNFP#30 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 V minimum. Its voltage detection circuit monitors VCC and triggers reset if supply drops below programmable thresholds, ensuring reliable startup and brown-out protection during transient conditions. This dual-voltage capability makes R5F21355CNFP#30 suitable for battery-backed and wide-input industrial power supplies.

Does the R5F21355CNFP#30 support hardware LIN communication, and how is it implemented?

Yes, the R5F21355CNFP#30 includes a dedicated hardware LIN module that combines UART0 and timer RA to meet LIN 2.0/2.1 physical layer requirements. It handles automatic baud rate synchronization, checksum generation, and frame timing without CPU intervention. The LIN functionality is enabled via SFR configuration and uses standard pins P1_5 (RXD0) and P1_4 (TXD0), allowing R5F21355CNFP#30 to serve as a slave node in automotive body electronics or appliance sub-networks.

How does the background operation (BGO) function work in the R5F21355CNFP#30 data flash?

The R5F21355CNFP#30 supports background operation (BGO) on its 4 KB data flash (1 KB × 4 blocks), enabling erase and program operations while the CPU executes code from main ROM. BGO is controlled via the FMRDYIF flag and FMRDYIC register, allowing firmware to update calibration tables or logging data without system interruption. This capability is critical for R5F21355CNFP#30 deployments requiring zero-downtime field updates in audio processors or sensor nodes.

What timer resources does the R5F21355CNFP#30 provide for motor control applications?

The R5F21355CNFP#30 includes timer RD - a dual 16-bit unit with four capture/compare registers - capable of complementary PWM output on six pins with configurable dead time, synchronous reset, and triangular/sawtooth modulation. Combined with timer RC's 3-pin PWM and timer RB's programmable waveform generation, R5F21355CNFP#30 delivers full three-phase motor control without external timers, supporting BLDC and stepper drive in printers, fans, and kitchen appliances.

Is the R5F21355CNFP#30 pin-compatible with other members of the R8C/35C Group?

Yes, all R8C/35C Group MCUs, including R5F21354CNFP through R5F2135CCNFP, share the identical 52-pin LQFP (PLQP0052JA-A) package and pin assignment. This allows direct substitution between variants - such as upgrading from R5F21355CNFP#30 to R5F21356CNFP for more ROM - without PCB redesign. Pin functions, peripheral mappings, and power/ground locations are fully consistent across the family.