The R5F102AAASP#V0 is a 2 KB RAM high performance microcontroller with 16 KB pogram memory, It delivers a lowest power consumption in their class and have an enhanced computing power and peripheral functions. 

The high-precision (±1%) on-chip oscillator makes 32 MHz CPU operation possible, and built-in features with background operation function help to lower the total cost of building a system and contribute to more compact size and lower power consumption.

Features:

• Ultra-Low Power Technology:
  • 1.8V to 5.5V operation from a single supply
  • Operating: 63 μA /MHz
• 16-bit RL78 CPU Core:
  • Maximum operating frequency of 24 MHz
  • 86% of instructions can be executed in 1 to 2 clock cycles
  • CISC Architecture (Harvard) with 3-stage pipeline
  • Multiply Signed & Unsigned: 16 x 16 to 32-bit result in 1 clock cycle
• Main Flash Memory:
  • Density: 2 KB to 16 KB
  • Block size: 1KB
  • On-chip single voltage flash memory with protection from block erase/writing
• Data Flash Memory:
  • Data Flash with background operation
  • Data flash size: 2 KB size options
  • Erase Cycles: 1 Million (typ.)
  • Erase/programming voltage: 1.8 V to 5.5 V
• RAM:
  • 256 B to 1.5 KB size options
  • Supports operands or instructions
  • Back-up retention in all modes
• High-speed Oscillator:
  • 24 MHz with +/- 1% accuracy
  • Pre-configured settings: 24 MHz, 16 MHz, 12 MHz, 8MHz, 4MHz & 1MHz
• Reset and Supply Management:
  • Power-on reset (POR) monitor/generator
  • Low voltage detection (LVD) with 12 setting options
• Multiple Communication Interfaces:
  • Up to 3 x I2C master
  • Up to 1 x I2C multi-master
  • Up to 3 x CSI/SPI (7-, 8-bit)
  • Up to 3 x UART (7-, 8-, 9-bit)
• General Purpose I/O:
  • 5V tolerant, high-current (up to 20 mA per pin)
  • Open-Drain, Internal Pull-up support
  • Operating Temperature: –40°C to +85°C