RX65N at 120 MHz — industrial gateway on a single die
The Renesas R5F565N4AGFP#30 is a 32-bit RXv2 microcontroller from the RX65N series, clocked at 120 MHz. The 100-LQFP package (14x14 mm body) gives you 78 general-purpose I/O lines, so most designs won't need a port expander for sensor feedback or relay drive. The peripheral set is built for connected industrial equipment: Ethernet MAC, two CAN channels, full-speed USB, QSPI for serial Flash expansion, and multiple SCI/SPI/I²C ports. The 22-channel 12-bit ADC and single 12-bit DAC handle analog sensor inputs and setpoint outputs directly. DMA, LVD, POR, PWM, and WDT round out the on-chip supervisory and timing resources.
512 KB Flash / 256 KB RAM — firmware and buffer budget
The 512 KB Flash partition gives you room for a lightweight RTOS, the TCP/IP stack, a CANopen or EtherCAT slave library, and still leaves space for OTA update staging. The 256 KB RAM handles packet buffers, sensor data queues, and the stack heap without thrashing. If your application needs more data logging space, the QSPI interface can map an external serial Flash into the memory map at 104 MHz.
100-LQFP with 78 I/O — layout and decoupling
The 78 I/O lines include the full Ethernet MII/RMII port, so keep the PHY within 50 mm of the MAC pins to hold signal integrity on the TX and RX clocks. Decouple each VDD/VSS pair with a 100 nF ceramic close to the pin; a 10 µF bulk cap per supply rail handles the transient draw when the core wakes from sleep.