32 MHz RX core in a 6x6 mm QFN — what it buys the design
The R5F51113AGNF#2A is a 32-bit RX-core microcontroller from the RX111 series, clocked at 32 MHz. The 32-bit data path and single-cycle multiply-accumulate give it the throughput for sensor fusion, motor commutation loops, and real-time control without an external DSP. On-chip memory totals 64 KB flash for program code, 10 KB SRAM for stack and variables, and 8 KB dedicated EEPROM for calibration constants or fault logs — the EEPROM block eliminates a separate serial EEPROM from the BOM. The 40-HWQFN package (6x6 mm, exposed pad) suits space-constrained sensor modules, handheld instruments, and compact actuator boards.
Active lifecycle — no forced migration risk
The part is ROHS3 compliant. For a BOM line that must stay stable through a multi-year production run, this part carries no imminent obsolescence risk.
On-chip peripherals include DMA, LVD, POR, PWM, and WDT — enough for a standalone controller without external watchdog or supervisor ICs. Connectivity covers I²C, SCI (UART), SPI, and USB — the USB interface is a differentiator versus the RX110 siblings that lack it. 24 general-purpose I/O pins are available; the 8-channel 12-bit ADC covers analog sensor inputs.