Renesas R5F21387CNFP#U0

Overview

R5F21387CNFP#U0 from Renesas Electronics is a 16-bit R8C CPU core MCU with 48 KB program flash, 4 KB data flash (BGO-capable), and 4 KB RAM, operating at up to 20 MHz (50 ns min instruction time) across 1.8–5.5 V supply. It integrates UART0/1/2 (with I²C mode), LIN hardware module, 10-bit × 20-channel ADC, dual 8-bit DACs, six timer units (RA–RG), DTC, and voltage detection circuitry - deployed in consumer audio and office equipment control subsystems.

For engineers reviewing the R5F21387CNFP#U0 datasheet, R5F21387CNFP#U0 pinout, R5F21387CNFP#U0 application, or R5F21387CNFP#U0 equivalent, key selection criteria include its 80-pin LQFP package, −20°C to +85°C N-version temperature grade, background operation for data flash updates, real-time clock (Timer RE), and hardware LIN support tied to Timer RA and UART0.

Technical Context

The R5F21387CNFP#U0 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 program ROM starting at 04000h, data flash at 03000h–03FFFh (four 1-KB blocks), and RAM at 00400h–013FFh.

Peripheral integration includes three UART channels (UART2 supports I²C bus mode), dedicated LIN hardware using UART0 and Timer RA, Timer RD with complementary PWM for three-phase motor control, and a DTC with 39 activation sources enabling autonomous transfers without CPU intervention.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PLQP0080KB-A, previous code 80P6Q-A), surface-mount, 12 mm × 12 mm body, 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21386CNFP and R5F21388CNFP, the R5F21387CNFP#U0 delivers optimal balance of code space (48 KB), data flash (4 KB), and peripheral density for mid-tier consumer control applications - avoiding over-provisioning while supporting robust field-upgrade capability.

Availability

R5F21387CNFP#U0 is available at Aetrix Electronics and suitable for audio signal processing, office equipment control, consumer appliance UI, and industrial panel interface applications requiring stable component supply and long-term production continuity.

Supply support for R5F21387CNFP#U0 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/38C Group, including the R5F21387CNFP#U0, was designed for cost-effective, low-power embedded control in consumer electronics - emphasizing integrated peripherals, flash flexibility, and EMI/EMS robustness.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for the R5F21387CNFP#U0?

The R5F21387CNFP#U0 operates at up to 20 MHz when supplied between 2.7 V and 5.5 V, achieving a minimum instruction execution time of 50 ns. At lower voltages (1.8–5.5 V), the maximum frequency reduces to 5 MHz (200 ns min instruction time), enabling flexible power/performance trade-offs in battery-powered devices.

Does the R5F21387CNFP#U0 support hardware LIN communication, and how is it implemented?

Yes, the R5F21387CNFP#U0 includes a dedicated hardware LIN module compliant with LIN 2.0/2.1 standards. It is implemented using UART0 for serial framing and Timer RA for precise baud rate generation and synchronization - offloading protocol handling from the CPU and ensuring deterministic timing without software stack overhead.

How does the background operation (BGO) function work in the R5F21387CNFP#U0 data flash?

The R5F21387CNFP#U0 supports background operation on its 4 KB data flash (organized as four 1-KB blocks), allowing erase and program operations to execute concurrently with CPU code execution from program flash. This enables seamless firmware updates, calibration data writes, or event logging without interrupting real-time control tasks.

What are the key low-power features of the R5F21387CNFP#U0, and what are their typical current draws?

The R5F21387CNFP#U0 offers wait mode (4.0 µA at 3.0 V with 32 kHz XCIN clock) and stop mode (2.0 µA at 3.0 V), both leveraging the low-speed on-chip oscillator. These modes retain RAM content and allow wake-up via external interrupt or RTC alarm - ideal for remote controls, sensor nodes, and standby functions in audio equipment.

Can the R5F21387CNFP#U0 generate three-phase PWM waveforms, and which timer unit provides this capability?

Yes, the R5F21387CNFP#U0 can generate synchronized three-phase PWM waveforms using Timer RD, which supports reset-synchronous PWM and complementary PWM modes. These modes drive six output pins (TRDIOA0/B0/C0/D0 and TRDIOA1/B1/C1/D1) with programmable dead-time insertion and fault protection - suitable for BLDC motor control in appliances.