System Overview
C8051F300/1/2/3/4/5 devices are fully integrated mixed-signal system-on-a-chip MCUs. Highlighted features are listed below. Refer to Table 1.1 on page 14for 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 8-bit 500 ksps 11-channel ADC with programmable gain pre-amplifier and analog multiplexer
(C8051F300/2 only)
• Precision programmable 25 MHz internal oscillator
•Up to 8 kB of on-chip Flash memory
• 256 bytes of on-chip RAM
•SMBus/I2C and Enhanced UART serial interfaces implemented in hardware
• Three general-purpose 16-bit timers
• Programmable counter/timer array (PCA) with three capture/compare modules and watchdog timer
function
• On-chip power-on reset, VDDmonitor, and temperature sensor
• On-chip voltage comparator
• Byte-wide I/O port (5 V tolerant)

Analog Peripherals
- 8-Bit ADC (F300/2 only)
  • Up to 500 ksps
  • Up to 8 external inputs
  • Programmable amplifier gains of 4, 2, 1, & 0.5
  • VREF from external pin or VDD
  • Built-in temperature sensor
  • External conversion start input - Comparator
  • Programmable hysteresis and response time
  • Configurable as interrupt or reset source
  • Low current (<0.5 µA)

On-chip Debug
- On-chip debug circuitry facilitates full speed, non-intrusive in-system debug (no emulator required)
- Provides breakpoints, single stepping, inspect/modify memory and registers
- Superior performance to emulation systems using ICE-chips, target pods, and sockets
- Complete development kit

Supply Voltage 2.7 to 3.6 V
- Typical operating current: 6.6 mA @ 25 MHz; 14 µA @ 32 kHz
- Typical stop mode current: 0.1 µA
- Temperature range: –40 to +85 °C

High Speed 8051 µc Core
- Pipelined instruction architecture; executes 70% of instructions in 1 or 2 system clocks
- Up to 25 MIPS throughput with 25 MHz clock
- Expanded interrupt handler

Memory
- 256 bytes internal data RAM
- Up to 8 kB (‘F300/1/2/3), 4 kB (‘F304), or 2 kB (‘F305) Flash; 512 bytes are reserved in the 8 kB devices

Digital Peripherals
- 8 Port I/O; All 5 V tolerant with high sink current
- Hardware enhanced UART and SMBus™ serial ports
- Three general-purpose 16-bit counter/timers
- 16-bit programmable counter array (PCA) with three capture/compare modules
- Real time clock mode using PCA or timer and external clock source

Clock Sources
- Internal oscillator: 24.5 MHz with ±2% accuracy supports UART operation
- External oscillator: Crystal, RC, C, or clock (1 or 2 pin modes)
- Can switch between clock sources on-the-fly; Useful in power saving modes

11-Pin Quad Flat No-Lead (QFN) RoHS Package
- 3 x 3 mm PWB footprint