256 KB Flash, 24 KB RAM, 8 KB EEPROM — memory budget for a sensor-heavy design
The Renesas R7F100GPJ3CFA#BA0 is a 16-bit RL78/G23 microcontroller that runs at 32 MHz from its internal oscillator. Program memory is 256 KB of Flash, backed by 24 KB of RAM for data buffers and stack, plus a separate 8 KB EEPROM block for non-volatile parameter storage that survives thousands of write cycles without wear-leveling overhead. This memory split suits applications that hold a modest firmware image (a few hundred kilobytes) alongside real-time sensor data logging and calibration constants that must persist across power cycles — think industrial sensor nodes, motor-drive parameter storage, or building-automation controllers that track runtime counters.
88 I/O and mixed-signal peripherals in a 100-LQFP
The 100-pin LQFP (14x20 mm) body brings out 88 general-purpose I/O lines, enough to interface with a parallel LCD, a keypad matrix, multiple encoder inputs, and a handful of serial buses without a port expander. On the analog side, the ADC bank offers twenty 10-bit channels for fast multiplexed scans and eight 12-bit channels for higher-resolution measurements — both feeding a single conversion engine — plus two 8-bit DAC outputs for set-point generation or analog trimming. The peripheral set includes Capacitive Touch sensing, LVD, POR, PWM, and WDT, covering the common housekeeping blocks for a standalone embedded controller. Connectivity options span CSI, I²C, LINbus, SPI, and UART/USART, which covers most sensor and actuator links in industrial and automotive sub-systems.
Industrial temperature range — -40°C to 105°C
The operating temperature range spans -40°C to 105°C, which qualifies the MCU for environments where the PCB sees sustained heat from a motor drive, an engine bay, or a sealed outdoor enclosure in direct sunlight. The 1.8 V to 5.5 V supply range means the same part can run from a single Li-ion cell (through a regulator) or a 5 V industrial rail without a level shifter on the power input. The 105°C ceiling is the key differentiator from the commercial-grade RL78/G23 variants that stop at 85°C — if your BOM calls for under-hood or high-ambient operation, this is the temperature grade to lock in.