Renesas R5F21367CNFA#U0

Overview

R5F21367CNFA#U0 from Renesas is a 16-bit R8C CPU core MCU with 48 KB program ROM, 4 KB data flash (BGO-capable), 4 KB RAM, and integrated peripherals including 10-bit ×12-channel ADC, dual 8-bit DACs, LIN hardware module, and six timer units (RA–RG) supporting PWM, capture/compare, and real-time clock functions - deployed in consumer audio and office equipment control systems.

For engineers reviewing the R5F21367CNFA#U0 datasheet, R5F21367CNFA#U0 pinout, R5F21367CNFA#U0 application, or R5F21367CNFA#U0 equivalent, key selection criteria include its 64-pin LQFP (PLQP0064GA-A) package, −20°C to +85°C operating range (N version), 20 MHz max external clock support at 2.7–5.5 V, and on-chip debug capability with background data flash rewrite.

Technical Context

The R5F21367CNFA#U0 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. It supports four clock sources: XIN (up to 20 MHz), XCIN (32 kHz), high-speed on-chip oscillator (frequency-adjustable), and low-speed on-chip oscillator.

Peripheral integration includes UART0/1/2 (with I²C mode on UART2), SSU, LIN hardware (using Timer RA and UART0), DTC (1 channel, 39 activation sources), and seven timers (RA–RG) delivering PWM outputs across up to 12 pins with complementary and reset-synchronous modes for motor control.

Key Specifications

Pinout & Package

64-pin LQFP package (PLQP0064GA-A), 10 mm × 10 mm body, 0.5 mm lead pitch, exposed pad not present. Pin 1 marked by notch or dot; thermal performance rated per JEDEC MS-026.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21367CNFA#U0, the CNFP variant offers identical electrical behavior in a mechanically distinct LQFP variant, while the CDFA variant maintains full compatibility but guarantees operation down to −40°C - enabling drop-in replacement in thermally demanding designs without firmware modification.

Availability

R5F21367CNFA#U0 is available at Aetrix Electronics and suitable for audio equipment control, office automation motor drives, home appliance user interfaces, and industrial sensor hubs requiring stable component supply over multi-year production cycles.

Supply support for R5F21367CNFA#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/36C Group, including R5F21367CNFA#U0, was designed for cost-sensitive, EMI-robust embedded control in consumer electronics - emphasizing low-power operation, integrated analog peripherals, and hardware-assisted communication protocols like LIN and I²C.

FAQ

What is the maximum operating frequency of the R5F21367CNFA#U0 under 3.3 V supply?

The R5F21367CNFA#U0 supports a maximum external clock frequency of 20 MHz when VCC is ≥2.7 V. At 3.3 V, it operates reliably at 20 MHz with minimum instruction execution time of 50 ns. Below 2.7 V, the maximum clock drops to 5 MHz (200 ns min. instruction time) to maintain timing margin across the 1.8–5.5 V operating range.

Does the R5F21367CNFA#U0 support in-system programming of its data flash memory?

Yes, the R5F21367CNFA#U0 supports in-system programming of its 4 KB data flash (1 KB × 4 blocks) using the on-chip debug interface. The background operation (BGO) function allows flash write/erase operations to proceed concurrently with program execution - critical for runtime parameter storage and firmware field updates without interrupting control loops.

How many independent PWM outputs does the R5F21367CNFA#U0 provide, and which timers generate them?

The R5F21367CNFA#U0 provides up to 12 independent PWM outputs: Timer RC delivers 3 pins in PWM mode; Timer RD provides 6 pins in standard PWM mode and an additional 3 pins in complementary PWM mode (totaling 6 active outputs in that configuration); Timer RB contributes 1 PWM output. All are configurable via dedicated registers and support dead-time insertion, polarity control, and synchronization triggers.

Is the R5F21367CNFA#U0 pin-compatible with other members of the R8C/36C Group?

Yes, all R8C/36C Group MCUs in the same package type - including R5F21367CNFA#U0 (PLQP0064GA-A) - share identical pinouts and electrical characteristics. Memory size, data flash allocation, and RAM capacity vary across part numbers, but I/O mapping, peripheral pin assignments, and power/ground locations remain fully consistent, enabling hardware reuse across firmware variants.

What debug interfaces are supported by the R5F21367CNFA#U0 for firmware development?

The R5F21367CNFA#U0 supports Renesas' on-chip debug interface via a 6-pin dedicated debug connector (including TDI, TDO, TCK, TMS, RESET, and VCC). It enables full JTAG-style debugging, flash programming, register inspection, and real-time trace - all without requiring external debug probes beyond standard Renesas E1/E20 emulators. No SWD or ARM-specific protocols are implemented.