Renesas R5F61644LN50FPV

Overview

R5F61644LN50FPV from Renesas Electronics is a 32-bit CISC microcontroller in the H8SX/1644L group, featuring a 50 MHz max CPU clock, 512 KB on-chip Flash memory, and integrated peripherals including TPU, SCI, WDT, and DTC. It serves as a system controller in industrial automation modules requiring deterministic real-time response and embedded firmware execution.

For engineers reviewing the R5F61644LN50FPV datasheet, R5F61644LN50FPV pinout, R5F61644LN50FPV application, or R5F61644LN50FPV equivalent, key selection criteria include its 144-pin LQFP package, 3.3 V single-supply operation, 50 MHz core frequency, Flash endurance of 10,000 write/erase cycles, and compliance with industrial temperature range (−40°C to +85°C).

Technical Context

The R5F61644LN50FPV implements the H8SX CPU core with three operating modes (Normal, Middle, Advanced), supports 32-bit addressing up to 4 GB, and integrates a Clock Pulse Generator (CPG) with PLL for internal clock synthesis from external crystal or oscillator inputs. Its interrupt controller (INTC) handles up to 128 vector sources with priority encoding and nesting support.

Peripheral integration includes a 16-bit Timer Pulse Unit (TPU) with 8 channels, four Serial Communications Interfaces (SCI) supporting asynchronous and clock-synchronous modes, and a Data Transfer Controller (DTC) enabling autonomous memory-to-peripheral transfers without CPU intervention - reducing interrupt load in high-throughput I/O applications.

Key Specifications

Pinout & Package

Package: 144-pin LQFP (20 mm × 20 mm, 0.5 mm pitch), thermally enhanced with exposed pad (FPV suffix). Pin layout optimized for signal integrity: dedicated VCC/VSS pairs per functional block, separate analog/digital ground pins, and configurable I/O with pull-up/down control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F61644LN50FPV, the R5F61644LN40FPV trades clock speed for cost reduction while maintaining identical peripheral count and package, whereas the R5F61648LN50FPV extends memory and I/O resources within the same footprint - enabling seamless migration paths for evolving design requirements.

Availability

R5F61644LN50FPV is available at Aetrix Electronics and suitable for industrial automation, motor control, building management, and factory test equipment requiring stable component supply across multi-year production cycles.

Supply support for R5F61644LN50FPV 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/1644L series, including R5F61644LN50FPV, was designed for high-reliability industrial control applications demanding deterministic real-time performance, long product lifecycle, and robust electromagnetic compatibility in electrically noisy environments.

FAQ

What is the maximum operating frequency of the R5F61644LN50FPV?

The R5F61644LN50FPV operates at a maximum CPU clock frequency of 50 MHz, achieved via its on-chip Clock Pulse Generator (CPG) with PLL circuitry. This frequency is guaranteed across the full industrial temperature range (−40°C to +85°C) and 3.3 V supply voltage. The R5F61644LN50FPV achieves this using an external crystal or clock source fed into the EXTAL/XTAL pins, with internal multiplication - no external clock generator IC is required for nominal operation.

Does the R5F61644LN50FPV support in-system programming (ISP) via serial interface?

Yes, the R5F61644LN50FPV supports in-system programming through its on-chip boot ROM, which implements a serial programming mode accessible via SCI0. Using the Renesas Flash Development Toolkit (FDT) and a standard UART connection, users can erase, program, and verify the 512 KB Flash memory without removing the R5F61644LN50FPV from the target board - enabling field firmware updates and manufacturing programming flexibility.

What is the Flash memory endurance specification for the R5F61644LN50FPV?

The R5F61644LN50FPV specifies Flash memory endurance of 10,000 write/erase cycles per sector under standard industrial conditions (3.3 V, 25°C). This rating applies to the entire 512 KB Flash array and is validated per JEDEC standards. Wear leveling must be implemented in firmware if frequent reprogramming of the same sector is required - the R5F61644LN50FPV does not include hardware wear-leveling logic.

Is the R5F61644LN50FPV pin-compatible with other members of the H8SX/1644 family?

Yes, the R5F61644LN50FPV shares identical pin assignment and electrical characteristics with other H8SX/1644L variants in the 144-pin LQFP package (e.g., R5F61644LN40FPV, R5F61644LN50FPV), including same power, ground, clock, reset, and peripheral I/O pin locations. However, it is not pin-compatible with H8SX/1644A or H8SX/1644G variants due to differences in peripheral enablement and internal routing - always verify the specific variant's Hardware Manual before substitution.

What development tools are officially supported for the R5F61644LN50FPV?

Renesas officially supports the R5F61644LN50FPV with the High-performance Embedded Workshop (HEW) IDE, C/C++ compiler (H8SX/HS8000 Family), and E8/E8a in-circuit emulators. Debugging is enabled via the on-chip debug interface using SWD or JTAG protocols. The R5F61644LN50FPV also works with modern toolchains like GCC-H8SX and open-source GDB frontends when configured with appropriate linker scripts and startup code from Renesas application notes.