Renesas R5F21357MNFP#50

Overview

R5F21357MNFP from Renesas is a 16-bit R8C CPU core MCU with 48 KB flash program ROM, 4 KB data flash (4 × 1 KB blocks with BGO), and 4 KB RAM, operating at up to 20 MHz (V_CC = 2.7–5.5 V). It integrates UART0/1/2, I²C, SSU, 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 in consumer appliance control systems.

For engineers reviewing the R5F21357MNFP datasheet, R5F21357MNFP pinout, R5F21357MNFP application, or R5F21357MNFP equivalent, key selection criteria include its 52-pin LQFP package, -20°C to +85°C temperature grade (N version), background operation (BGO) data flash capability, LIN-compliant UART0-based hardware protocol support, and integrated voltage detection with 7-level interrupt priority.

Technical Context

The R5F21357MNFP 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 FFDCh–FFFFh and data flash at 03000h–03FFFh.

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21357MDFP, the R5F21357MNFP offers lower-cost commercial-grade operation; compared with R5F21356MNFP, it provides 16 KB additional flash and 1.5 KB more RAM for enhanced feature sets and future firmware scalability.

Availability

R5F21357MNFP is available at Aetrix Electronics and suitable for home appliance motor control, consumer audio signal processing, office equipment power management, and industrial sensor node controller applications requiring stable component supply and long-term production continuity.

Supply support for R5F21357MNFP 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 manufacturer specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and consumer markets.

The R8C/35M Group, including R5F21357MNFP, was designed for cost-effective, low-power embedded control in consumer electronics-emphasizing integrated analog peripherals, motor timing, and communication flexibility without external components.

FAQ

What is the maximum operating frequency and supply voltage range for the R5F21357MNFP?

The R5F21357MNFP operates at up to 20 MHz when supplied with 2.7–5.5 V, and supports down to 5 MHz at 1.8 V minimum. Its R8C CPU core achieves 50 ns minimum instruction execution time at 20 MHz, enabling responsive real-time control in appliance and audio applications where deterministic timing is critical. The wide voltage range allows direct connection to unregulated battery or adapter supplies.

Does the R5F21357MNFP support background operation (BGO) for data flash programming?

Yes, the R5F21357MNFP supports background operation (BGO) for its 4 KB data flash (organized as four 1 KB blocks). This allows firmware to execute from program ROM while simultaneously erasing or programming data flash-essential for over-the-air updates, parameter logging, or calibration storage without system interruption. BGO is enabled via dedicated control registers and requires no external hardware support.

How many UART interfaces does the R5F21357MNFP include, and what advanced features do they support?

The R5F21357MNFP includes three UART interfaces: UART0 (with hardware LIN support), UART1, and UART2 (which operates in UART, clock-synchronous serial I/O, or I²C-bus modes). UART2's I²C capability enables direct sensor interfacing without additional level shifters, while UART0's LIN compliance-combined with Timer RA-provides full ISO 9141-2 and LIN 2.x protocol handling for automotive and appliance network nodes.

What timer resources are available on the R5F21357MNFP for motor control applications?

The R5F21357MNFP provides six dedicated timers optimized for motor control: Timer RA/RB (8-bit, PWM generation), Timer RC (16-bit, 4-channel capture/compare), Timer RD (dual 16-bit, 6-PWM output with complementary, sawtooth, and triangular wave modulation), and Timer RE (8-bit real-time clock). Timer RD's reset-synchronous and complementary PWM modes directly support three-phase inverter drive with programmable dead time and phase alignment-reducing external logic requirements.

Is the R5F21357MNFP pin-compatible with other members of the R8C/35M Group?

Yes, all R8C/35M Group MCUs-including R5F21354MNFP through R5F2135CMNFP-are housed in the identical 52-pin LQFP (PLQP0052JA-A) package with fully compatible pinouts. This enables hardware reuse across product variants: firmware can scale from 16 KB to 128 KB flash by selecting the appropriate part, while maintaining identical PCB layout, debug interface, and peripheral routing for cost-efficient platform development.