Renesas R5F21388CNFP#U0

Overview

R5F21388CNFP#U0 from Renesas Electronics is a 16-bit R8C CPU core microcontroller with 64 KB flash program ROM, 6 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), features 75 CMOS I/O ports with pull-up resistors, and integrates UART0/1/2, I²C, LIN, 10-bit × 20-channel ADC, dual 8-bit DACs, and six timer modules (RA–RG) for motor control and real-time applications in consumer appliances.

For engineers reviewing the R5F21388CNFP#U0 datasheet, R5F21388CNFP#U0 pinout, R5F21388CNFP#U0 application, or R5F21388CNFP#U0 equivalent, key selection criteria include its 80-pin LQFP package, −20°C to +85°C industrial temperature grade (N version), on-chip debug support, and hardware LIN module implementation using Timer RA and UART0 - critical for appliance communication subsystems.

Technical Context

The R5F21388CNFP#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 fixed interrupt vector table at 0FFDCh–0FFFFh and data flash at 03000h–03FFFh.

It supports four clock sources: XIN (up to 20 MHz crystal), XCIN (32 kHz crystal), high-speed on-chip oscillator (frequency-adjustable), and low-speed on-chip oscillator. Power management includes wait mode (4.0 µA @ 3.0 V, 32 kHz) and stop mode (2.0 µA @ 3.0 V), with voltage detection circuits for power-on reset and configurable level monitoring.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PLQP0080KB-A), 12 mm × 12 mm, 0.5 mm pitch, exposed pad not specified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21387CNFP and R5F2138ACNFP, the R5F21388CNFP#U0 delivers optimal balance of flash (64 KB), RAM (6 KB), and peripheral integration for mid-tier consumer appliances - avoiding under-provisioning of memory while minimizing die cost versus higher-density variants.

Availability

R5F21388CNFP#U0 is available at Aetrix Electronics and suitable for home appliance motor control, audio system front-end design, office equipment power management, and consumer IoT sensor hub applications requiring stable component supply and long-term industrial availability.

Supply support for R5F21388CNFP#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 delivering microcontrollers, analog, power, and SoC products for automotive, industrial, and consumer markets.

The R8C/38C Group, including R5F21388CNFP#U0, was designed for cost-sensitive, high-reliability embedded control in consumer electronics - emphasizing EMI/EMS robustness, integrated analog peripherals, and low-power operation across wide voltage ranges.

FAQ

What is the maximum operating frequency of the R5F21388CNFP#U0 and under what conditions?

The R5F21388CNFP#U0 achieves a maximum operating frequency of 20 MHz when supplied with VCC = 2.7–5.5 V and using the XIN clock source. At lower supply voltages (1.8–5.5 V), the maximum frequency is reduced to 5 MHz. The minimum instruction execution time is 50 ns at 20 MHz, enabling deterministic real-time response for motor control loops and communication protocols.

Does the R5F21388CNFP#U0 support in-system programming and how is it implemented?

Yes, the R5F21388CNFP#U0 supports in-system programming via its on-chip debug interface and background operation (BGO) function. Program ROM and data flash can be rewritten while the CPU executes user code - critical for field firmware updates. Programming requires Renesas Flash Development Toolkit and a compatible debug adapter (e.g., E8a or E2 Lite), with no external high-voltage supply needed.

How many analog input channels does the R5F21388CNFP#U0 ADC support and what is its resolution?

The R5F21388CNFP#U0 integrates a 10-bit successive approximation ADC with 20 fully differential input channels (AN0–AN19). It includes sample-and-hold functionality and sweep mode for automatic sequential conversion across selected channels - enabling simultaneous monitoring of multiple sensors in home appliance applications without external multiplexers.

What peripheral resources does the R5F21388CNFP#U0 provide for motor control applications?

The R5F21388CNFP#U0 provides dedicated motor control peripherals including Timer RD (16-bit × 2, 6 PWM outputs), Timer RC (16-bit, 3 PWM outputs), and complementary PWM modes with dead-time insertion. Combined with 10-bit ADC for current sensing and dual 8-bit DACs for reference generation, it supports sensorless BLDC and PMSM control without external timers or DACs.

Is the R5F21388CNFP#U0 pin-compatible with other members of the R8C/38C Group?

Yes, all R8C/38C Group MCUs, including R5F21386CNFP, R5F21387CNFP, R5F21388CNFP#U0, R5F2138ACNFP, and R5F2138CCNFP, share identical 80-pin LQFP (PLQP0080KB-A) packaging and pinout. Firmware and PCB designs are interchangeable across the family - only flash/RAM capacity and data flash block count differ, enabling scalable product variants from a single hardware platform.