The C8051F864-C-IS is a microcontroller manufactured by Silicon Labs. It is based on the 8051 architecture and is part of the C8051F86x family of devices. It has 16 kBytes of on-chip Flash memory with read/write capability, 128 bytes of RAM, 4 kB of data flash with read/write capability, and up to 64 pins. It also features an integrated voltage regulator, two I2C/SPI buses, UARTs and 25 I/O lines. It also provides an 8051-based SPI V1.1 slave, 12-bit ADC, 16-bit TIMERs, PWM and up to 54 interrupt sources. The C8051F864-C-IS is ideal for applications that require performance, low power and space, such as embedded automotive diagnostics, industrial process control and consumer electronics.