Real Time Clock (RTC) IC Clock/Calendar I²C, 2-Wire Serial 14-TSSOP (0.173", 4.40mm Width)..
RXv2 RX600 Microcontroller IC 32-Bit Single-Core 120MHz 2MB (2M x 8) FLASH 177-TFLGA (8x8)..
RL78 RL78/G13 Microcontroller IC 16-Bit 32MHz 256KB (256K x 8) FLASH 80-LQFP (14x14)..
RXv3 RX66T Microcontroller IC 32-Bit Single-Core 160MHz 512KB (512K x 8) FLASH 100-LFQFP (14x14)..