Renesas R5F21387CNFP#30

Overview

R5F21387CNFP#30 from Renesas is a 16-bit R8C CPU core microcontroller 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 for embedded control in consumer and industrial systems.

For engineers reviewing the R5F21387CNFP#30 datasheet, R5F21387CNFP#30 pinout, R5F21387CNFP#30 application, or R5F21387CNFP#30 equivalent, key selection criteria include its 80-pin LQFP package, −20°C to +85°C N-version temperature grade, background operation data flash, real-time clock (Timer RE), and hardware LIN support via UART0 and Timer RA.

Technical Context

The R5F21387CNFP#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, with fixed interrupt vector table at 0FFDCh–0FFFFh and data flash blocks A–D mapped to 03000h–03FFFh.

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

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21388CNFP, the R5F21387CNFP#30 offers optimal cost/performance balance for mid-complexity applications; versus R5F21387CDFP, it trades extended temperature tolerance for lower unit cost in controlled environments.

Availability

R5F21387CNFP#30 is available at Aetrix Electronics and suitable for home appliance control, office equipment motor drive, audio system front-end, and consumer IoT sensor hub applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for R5F21387CNFP#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 manufacturer specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and consumer markets.

The R8C/38C Group, including R5F21387CNFP#30, was designed for cost-sensitive, low-to-mid complexity embedded control applications demanding high EMI/EMS immunity, integrated analog peripherals, and robust flash reliability in consumer and industrial equipment.

FAQ

What is the maximum operating frequency and corresponding instruction execution time for the R5F21387CNFP#30?

The R5F21387CNFP#30 operates at up to 20 MHz with a minimum instruction execution time of 50 ns when VCC is 2.7–5.5 V. At lower frequencies such as 5 MHz (VCC = 1.8–5.5 V), the minimum instruction time is 200 ns. These values are measured under specified voltage and temperature conditions and reflect the R8C CPU core's deterministic timing behavior.

Does the R5F21387CNFP#30 support hardware LIN communication, and how is it implemented?

Yes, the R5F21387CNFP#30 includes a dedicated hardware LIN module that combines UART0 and Timer RA to meet LIN 2.0/2.1 physical layer requirements. This implementation handles baud rate generation, sync field detection, and checksum calculation in hardware, reducing CPU load and ensuring timing compliance without software bit-banging.

How does the background operation (BGO) function work in the R5F21387CNFP#30 data flash?

The R5F21387CNFP#30 supports background operation (BGO) on its 4 KB data flash (1 KB × 4 blocks), allowing program execution to continue uninterrupted while flash erase or write operations occur. BGO is enabled via dedicated SFR bits and requires proper interrupt masking and status polling - no CPU stall occurs, enabling real-time logging or firmware patching.

What are the key low-power modes supported by the R5F21387CNFP#30, and what is the typical current consumption in each?

The R5F21387CNFP#30 supports wait mode (4.0 µA at 3.0 V, f(XCIN) = 32 kHz) and stop mode (2.0 µA at 3.0 V). In stop mode, the CPU, most peripherals, and high-speed clocks halt while RAM and certain wake-up sources (INT0–INT4, key inputs) remain active. Wait mode retains more peripheral clocks and offers faster wake-up latency.

Can the R5F21387CNFP#30 operate with an external 32.768 kHz crystal for real-time clock functionality, and which pins are used?

Yes, the R5F21387CNFP#30 uses the XCIN and XCOUT pins (P4_3 and P4_4) to connect a 32.768 kHz crystal for Timer RE real-time clock operation. This low-frequency oscillator drives the 8-bit Timer RE in calendar mode (seconds/minutes/hours/days-of-week) and remains active in stop mode, enabling accurate timekeeping with minimal power draw.