Renesas R5F21356CNFP#50

Overview

R5F21356CNFP from Renesas Electronics is a 16-bit R8C CPU core MCU with 32 KB flash program ROM, 2.5 KB RAM, and 4 KB data flash (1 KB × 4 blocks) supporting background operation (BGO). It operates at up to 20 MHz (VCC = 2.7–5.5 V), integrates 10-bit ADC (12 channels), dual 8-bit DACs, LIN hardware module, and six timer units including PWM-capable Timer RD for motor control in consumer appliance power stages.

For engineers reviewing the R5F21356CNFP datasheet, R5F21356CNFP pinout, R5F21356CNFP application, or R5F21356CNFP equivalent, key selection criteria include its 52-pin LQFP package, -20°C to +85°C temperature grade (N version), integrated voltage detection circuitry, low-power wait/stop modes (down to 2.0 µA), and hardware LIN support for automotive body electronics interoperability.

Technical Context

The R5F21356CNFP implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. Its memory map allocates 32 KB program ROM (08000h–0FFFFh), 2.5 KB RAM (00400h–00DFFh), and 4 KB data flash (03000h–03FFFh), all within a unified 1 Mbyte address space.

Peripheral integration includes three UART/serial interfaces (UART0–2), I²C bus (shared with SSU), 12-channel 10-bit ADC with sample-and-hold and sweep mode, two 8-bit DAC outputs (DA0/DA1), dual comparators (B1/B3), and four clock sources: XIN (up to 20 MHz), XCIN (32 kHz), high-speed on-chip oscillator (adjustable), and low-speed on-chip oscillator.

Key Specifications

Pinout & Package

Package: 52-pin LQFP (PLQP0052JA-A), 10 mm × 10 mm body, 0.65 mm pin pitch, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21356CDFP, the R5F21356CNFP offers identical functionality at lower cost and qualification level for commercial environments; compared with R5F21355CNFP, it provides 8 KB additional flash and 512 bytes more RAM for complex control loops or expanded communication stacks.

Availability

R5F21356CNFP is available at Aetrix Electronics and suitable for home appliance motor control, audio equipment signal processing, and office equipment power management requiring stable component supply throughout product lifecycles.

Supply support for R5F21356CNFP 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 R5F21356CNFP, was designed for cost-effective, low-power embedded control in consumer electronics-emphasizing integrated peripherals, BGO flash, and hardware LIN to reduce system BOM and design complexity.

FAQ

What is the maximum operating frequency of the R5F21356CNFP?

The R5F21356CNFP supports a maximum operating frequency of 20 MHz when powered at VCC = 2.7–5.5 V using the XIN clock source. At lower supply voltages (1.8–5.5 V), the maximum frequency reduces to 5 MHz. The on-chip high-speed oscillator is factory-trimmed and adjustable via FRA registers to maintain timing accuracy across voltage and temperature variations.

Does the R5F21356CNFP support in-circuit debugging?

Yes, the R5F21356CNFP includes an on-chip debug interface compatible with Renesas E8/E8a emulators. This enables full real-time debugging-including breakpoints, watchpoints, register inspection, and flash programming-without requiring external JTAG hardware or modifying the target PCB layout.

How many analog-to-digital converter channels does the R5F21356CNFP have?

The R5F21356CNFP features a 10-bit successive-approximation ADC with 12 analog input channels (AN0–AN11). It supports sample-and-hold operation and sweep mode for automatic sequential conversion across selected channels, reducing CPU overhead during sensor data acquisition.

What is the purpose of the data flash memory in the R5F21356CNFP?

The R5F21356CNFP includes 4 KB of data flash memory (1 KB × 4 blocks) used for non-volatile parameter storage, calibration data, or firmware update staging. Its background operation (BGO) capability allows read/write/erase operations while the CPU executes application code-critical for fail-safe over-the-air updates.

Can the R5F21356CNFP generate complementary PWM waveforms?

Yes, the R5F21356CNFP's Timer RD unit supports complementary PWM mode with configurable dead-time insertion, enabling direct drive of three-phase inverter bridges. It outputs six synchronized PWM signals (three high-side + three low-side) with triangular wave modulation-essential for BLDC and PMSM motor control applications.