RX110 at 32 MHz — what the core means for the loop
The Renesas R5F51105AGFM#30 is a 32-bit RX-core MCU from the RX110 series, clocked at 32 MHz. It carries 128 KB of Flash program memory and 16K x 8 of RAM, with a 14-channel 12-bit ADC for direct sensor acquisition. Peripherals include DMA, LVD, POR, PWM, and WDT; connectivity covers I²C, SCI, and SPI. The 64-LQFP package provides 50 I/O. Operating temperature spans -40 to 105 °C, making it suitable for industrial control, motor drive, and outdoor telecom nodes where the board sees ambient heat but no forced cooling.
Flash and RAM — sizing the firmware budget
That Flash budget handles a modest RTOS kernel, a communication stack (e.g., Modbus RTU over SCI), and application logic for a sensor hub or a single-axis motor controller. The 16 KB RAM supports a few moderate-size buffers; if your application needs large frame buffers or extensive data logging, step up to the higher-density siblings in the RX110 line.
14-channel ADC — multi-sensor without external mux
The 14-channel 12-bit ADC lets you monitor multiple analog inputs — thermistors, current shunts, potentiometers — without adding an external multiplexer.