System Overview
C8051F39x/37x devices are fully integrated mixed-signal System-on-a-Chip MCUs. Highlighted features are listed below. Refer to Section “2. Ordering Information” on page 20 for specific product feature selection and part ordering numbers.

■ High-speed pipelined 8051-compatible microcontroller core (up to 50 MIPS)
■ In-system, full-speed, non-intrusive debug interface (on-chip)
■ True 10-bit 500 ksps 20 or 16-channel single-ended/differential ADC with analog multiplexer
■ Two 10-bit Current Output DACs
■ Precision temperature sensor with ±2 °C absolute accuracy
■ Precision programmable 49 MHz internal oscillator
■ Low-power, low-frequency oscillator
■ 16 kB of on-chip Flash memory
■ 1024 bytes of on-chip RAM
■ Co-packaged with 512 bytes of EEPROM memory, accessible via I2C (C8051F37x)
■ Two SMBus/I2C, UART, and SPI serial interfaces implemented in hardware
■ Six general-purpose 16-bit timers
■ Programmable Counter/Timer Array (PCA) with three capture/compare modules and Watchdog Timer function
■ On-chip Power-On Reset, VDD Monitor, and Temperature Sensor
■ On-chip Voltage Comparator
■ 21 or 17 Port I/O
■ Low-power suspend mode with fast wake-up time