C8051F31x devices are fully integrated mixed-signal System-on-a-Chip MCUs. Highlighted features are listed below. Refer to Table 1.1for specific product feature selection.

• High-speed pipelined 8051-compatible microcontroller core (up to 25 MIPS)
• In-system, full-speed, non-intrusive debug interface (on-chip)
• True 10-bit 200 ksps 25-channel single-ended/differential ADC with analog multiplexer (C8051F310/1/2/3/6)
• Precision programmable 25 MHz internal oscillator
• 16 kB (C8051F310/1/6/7) or 8 kB (C8051F312/3/4/5) of on-chip Flash memory
• 1280 bytes of on-chip RAM
• SMBus/I2C, Enhanced UART, and Enhanced SPI serial interfaces implemented in hardware
• Four general-purpose 16-bit timers
• Programmable Counter/Timer Array (PCA) with five capture/compare modules and Watchdog Timer function
• On-chip Power-On Reset, VDDMonitor, and Temperature Sensor
• On-chip Voltage Comparators
• 29/25/21 Port I/O (5 V tolerant)