Renesas has introduced industrial microcontrollers with integrated MRAM and clock speeds up to 600MHz, giving its RX family a major hardware upgrade.
The RX74M and RX74N are the first members of the family manufactured using a 22nm process. They replace conventional flash program storage with non-volatile magnetic memory.
According to Igor’sLAB, both use Renesas’s RXv3e processor core. Maximum clock speeds rise from 240MHz in the previous RX72 generation to 600MHz, depending on the model.
Renesas is targeting industrial control systems, robotics and demanding real-time applications. Factory machinery should appreciate the extra processing capacity, provided nobody insists on installing a chatbot in the conveyor belt.
The chips integrate up to 1MB of code MRAM with dual-bank support, 48KB of data MRAM, and 1.5MB of error-corrected SRAM.
MRAM stores information using magnetic states and retains its contents when power is removed. Unlike conventional flash, it doesn’t require a block-erase operation before overwriting data.
That can simplify frequent writes and firmware updates. Dual-bank support lets you prepare a new program image while an existing image remains available, though firmware determines how switching between them works.
The RXv3e core includes a double-precision floating-point unit and mechanisms to accelerate saving processor registers during interrupts.
Those features matter in systems juggling sensors, motors, and communications, where predictable response times matter more than an impressive benchmark score.
Renesas specifies a typical CoreMark result of 6.01 points per MHz. Actual application performance depends on memory access, interrupt handling, and peripheral use.
The RX74M places greater emphasis on industrial networking. It integrates an EtherCAT slave controller, two Gigabit Ethernet MACs, and an Ethernet switch that supports Time-Sensitive Networking.
EtherCAT supports tightly timed communication between industrial devices. TSN adds mechanisms for coordinating time-sensitive traffic across Ethernet networks.
The RX74N targets industrial applications that don’t require the RX74M’s specific EtherCAT capabilities. Other interfaces across the range include CAN FD, USB 2.0 and I3C, depending on the variant.
Hardware protection features include cryptographic acceleration, tamper detection and Renesas’s Protect Zone technology, which isolates sensitive memory and execution areas.
The devices support supply voltages from 1.62V to 3.63V and junction temperatures from minus 40°C to 125°C. Package options include QFP and BGA designs with 100 to 320 pins.
The families are generally available, although independent measurements of power consumption, real-time behaviour, and application performance are not available.
