C8051F340/1/2/3/4/5/6/7 devices are fully integrated mixed-signal System-on-a-Chip MCUs. Highlighted features are listed below. Refer to Table 1.1 for specific product feature selection. ? High-speed pipelined 8051-compatible microcontroller core （up to 48 MIPS） ? In-system， full-speed， non-intrusive debug interface （on-chip） ? Universal Serial Bus （USB） Function Controller with eight flexible endpoint pipes， integrated transceiver， and 1 kB FIFO RAM ? Supply Voltage Regulator ? True 10-bit 200 ksps differential / single-ended ADC with analog multiplexer ? On-chip Voltage Reference and Temperature Sensor ? On-chip Voltage Comparators （2） ? Precision internal calibrated 12 MHz internal oscillator and 4x clock multiplier ? Internal low-frequency oscillator for additional power savings ? Up to 64 kB of on-chip Flash memory ? Up to 4352 Bytes of on-chip RAM （256 + 4 kB） ? External Memory Interface （EMIF） available on 48-pin versions. ? SMBus/I2C， up to 2 UARTs， 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， VDD Monitor， and Missing Clock Detector ? Up to 40 Port I/O （5 V tolerant）