Renesas R5F61668MD50FPV

Overview

R5F61668MD50FPV from Renesas Electronics is a 32-bit CISC microcontroller in the H8SX/1668M Group, featuring a 50 MHz maximum CPU clock, 1 MB on-chip Flash memory, and integrated peripherals including TPU, SCI, WDT, and DTC. It operates from a 3.0–3.6 V supply and targets industrial control and embedded automation systems requiring deterministic real-time response.

For engineers reviewing the R5F61668MD50FPV datasheet, R5F61668MD50FPV pinout, R5F61668MD50FPV application, or R5F61668MD50FPV equivalent, key selection criteria include its 144-pin LQFP package, 50 MHz operation with internal PLL, 1 MB Flash/64 KB RAM memory map, and support for CAN-free real-time control via TPU and interrupt controller (INTC) with 128 vectors.

Technical Context

The R5F61668MD50FPV implements the H8SX CPU core with three operating modes (Normal, Middle, Advanced), supporting 32-bit addressing and 16/32-bit instruction execution. It integrates a Clock Pulse Generator (CPG) with PLL for internal clock multiplication and supports external crystal or oscillator inputs up to 20 MHz.

Its peripheral set includes a 16-bit Timer Pulse Unit (TPU) with 16 channels, four Serial Communications Interfaces (SCI) with UART/CLK sync modes, a Data Transfer Controller (DTC) for autonomous memory-to-peripheral transfers, and a Bus State Controller (BSC) enabling flexible external bus expansion up to 16-bit data width.

Key Specifications

Pinout & Package

Package: 144-pin LQFP (20 mm × 20 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level (MSL) 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F61668ND50FPV, the R5F61668MD50FPV offers identical functionality at lower temperature grade and cost; compared with R5F566TEADFP, it provides proven real-time determinism and smaller footprint for cost-sensitive motion applications where 50 MHz and fixed-point arithmetic are sufficient.

Availability

R5F61668MD50FPV is available at Aetrix Electronics and suitable for industrial PLC modules, motion control drives, factory automation gateways, and embedded HMI controllers requiring stable component supply across multi-year production cycles.

Supply support for R5F61668MD50FPV 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 industrial, automotive, and infrastructure markets.

The H8SX/1668M Group, including R5F61668MD50FPV, was designed for deterministic real-time control in resource-constrained industrial equipment - emphasizing low-latency interrupt handling, integrated timer peripherals, and robust Flash reliability for unattended operation.

FAQ

What is the maximum operating frequency of the R5F61668MD50FPV?

The R5F61668MD50FPV supports a maximum CPU clock frequency of 50 MHz, achieved using its internal PLL to multiply an external 1–20 MHz crystal or oscillator input. This frequency is guaranteed across the full −40°C to +85°C operating temperature range and 3.0–3.6 V supply voltage, enabling consistent real-time performance in industrial control loops without derating.

Does the R5F61668MD50FPV include on-chip Flash memory, and what is its capacity?

Yes, the R5F61668MD50FPV integrates 1 MB of on-chip Flash memory organized in 1 Kword pages, supporting in-application programming (IAP) and secure erase. This capacity accommodates complex firmware with bootloader, safety monitors, communication protocols (e.g., Modbus, CANopen), and field-upgradeable application code - eliminating need for external nonvolatile storage in most industrial designs.

How many serial communication interfaces does the R5F61668MD50FPV support, and what protocols are implemented?

The R5F61668MD50FPV includes four independent Serial Communications Interfaces (SCI), each configurable as UART, clock-synchronous serial, or LIN master. No native CAN or USB PHY is integrated; SCI units support baud rates up to 2 Mbps and feature programmable oversampling, noise filtering, and automatic break detection - ideal for RS-232/RS-485 industrial networking and sensor interfacing.

What debug capabilities are available on the R5F61668MD50FPV?

The R5F61668MD50FPV features an on-chip debug (OCD) module compliant with IEEE 1149.1 (JTAG), enabling full visibility into CPU registers, memory, and peripheral states during active execution. It supports breakpoint setting, watchpoint triggering, real-time trace buffer, and flash programming - all without halting the CPU, making it suitable for debugging time-critical control tasks in live systems running R5F61668MD50FPV firmware.

Is the R5F61668MD50FPV pin-compatible with other devices in the H8SX/1668M Group?

Yes, the R5F61668MD50FPV shares identical pin assignment, electrical characteristics, and memory map with other members of the H8SX/1668M Group (e.g., R5F61664M, R5F61663M) in the 144-pin LQFP package. This allows hardware reuse across variants differing only in Flash/RAM size or peripheral enablement - simplifying design scalability and inventory management for R5F61668MD50FPV-based platforms.