Renesas R5F21357MNFP#30

Overview

R5F21357MNFP#30 from Renesas Electronics is a 16-bit R8C CPU core microcontroller with 48 KB flash program memory, 4 KB data flash (BGO-capable), and 4 KB RAM, operating at up to 20 MHz (V_CC = 2.7–5.5 V). It integrates UART0/1/2, I²C, LIN hardware, 10-bit × 12-channel ADC, dual 8-bit DACs, six timer modules (RA–RE), DTC, and voltage detection - deployed in consumer audio and office equipment control subsystems.

For engineers reviewing the R5F21357MNFP#30 datasheet, R5F21357MNFP#30 pinout, R5F21357MNFP#30 application, or R5F21357MNFP#30 equivalent, key selection criteria include its 52-pin LQFP package, -20°C to +85°C N-version temperature grade, background operation data flash, LIN protocol support via UART0+Timer RA, and real-time clock capability in Timer RE.

Technical Context

The R5F21357MNFP#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 (00000h–FFFFFh), with fixed interrupt vector table at FFDCh–FFFFh and data flash blocks A–D mapped at 03000h–03FFFh.

Peripheral integration includes three UART channels (UART0/1/2), one I²C bus (shared with SSU), hardware LIN using UART0 and Timer RA, and four independent timer units (RC, RD0, RD1, RE) supporting input capture, PWM generation (up to 6 pins), complementary PWM, and real-time clock mode with second/minute/hour/day-of-week counting.

Key Specifications

Pinout & Package

Package: 52-pin LQFP (PLQP0052JA-A), 10 mm × 10 mm body, 0.65 mm pin pitch, -20°C to +85°C ambient operating range (N version).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21357MDFP, the R5F21357MNFP#30 trades extended temperature rating for lower cost and standard qualification; versus R5F21356MNFP, it delivers +16 KB ROM and +1.5 KB RAM for complex UI or communication stacks without changing PCB layout.

Availability

R5F21357MNFP#30 is available at Aetrix Electronics and suitable for consumer audio systems, office equipment motor controllers, home appliance user interfaces, and industrial panel meter front-ends requiring stable component supply across production lifecycles.

Supply support for R5F21357MNFP#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, power, and SoC solutions for automotive, industrial, and IoT markets.

The R8C/35M Group, including the R5F21357MNFP#30, was designed for cost-effective, low-power embedded control in consumer electronics - emphasizing integrated peripherals (LIN, RTC, ADC/DAC), EMI/EMS robustness, and background flash reprogramming.

FAQ

What is the maximum operating frequency of the R5F21357MNFP#30?

The R5F21357MNFP#30 operates at up to 20 MHz when supplied with V_CC = 2.7–5.5 V using the XIN clock source. At lower supply voltages (1.8–5.5 V), the maximum frequency is 5 MHz. The high-speed on-chip oscillator supports adjustable frequencies, and the 32 kHz XCIN circuit enables low-power real-time clock operation independent of main clock domain. This dual-clock architecture allows dynamic switching between performance and power-saving modes.

Does the R5F21357MNFP#30 support hardware LIN communication?

Yes, the R5F21357MNFP#30 includes a dedicated hardware LIN module that combines UART0 and Timer RA to implement LIN 2.1 protocol without external transceivers. It supports automatic header detection, checksum calculation, and configurable baud rates. The LIN functionality is fully integrated into the MCU's peripheral set and controlled via dedicated SFRs such as U0MR and TRAIC, enabling robust automotive body electronics communication in applications like lighting control or sensor networks.

How does the background operation (BGO) function work in the R5F21357MNFP#30?

The R5F21357MNFP#30 implements Background Operation (BGO) for its 1 KB × 4-block data flash, allowing erase and program operations to execute concurrently with CPU code execution from main ROM. BGO is controlled via the FMRDYIF flag and FMST bit in flash control registers. This enables live firmware updates, parameter storage during runtime, and fail-safe logging without interrupting real-time tasks - critical for audio playback, motor control, or UI responsiveness in consumer devices.

What are the analog capabilities of the R5F21357MNFP#30?

The R5F21357MNFP#30 integrates a 10-bit resolution ADC with 12 input channels (AN0–AN11), sample-and-hold circuitry, and sweep mode for automated sequential conversion. It also features two independent 8-bit DACs (DA0, DA1) with dedicated output pins (P0_6, P0_7). Comparator A and B modules provide voltage monitoring and threshold detection. These analog resources support sensor interfacing, audio signal generation, power supply monitoring, and closed-loop control without external components.

Is the R5F21357MNFP#30 pin-compatible with other R8C/35M Group MCUs?

Yes, the R5F21357MNFP#30 shares identical 52-pin LQFP (PLQP0052JA-A) packaging and pinout with all members of the R8C/35M Group, including R5F21354–R5F2135CMNFP/MDFP variants. Peripheral signal assignments, power/ground locations, and reset/oscillator pins are fully aligned. This enables direct substitution within the same footprint for memory scaling or temperature grade changes - provided software accommodates differences in ROM/RAM size and D-version qualification requirements.