Analog Peripherals
8-Bit ADC
   - ±1/2 LSB INL; no missing codes
   - Programmable throughput up to 100 ksps
   - 32 external inputs (each port I/O can be configured as an ADC input on the-fly)
   - Programmable amplifier gain: 16, 8, 4, 2, 1, 0.5
   - Data-dependent windowed interrupt generator
   - VREF from external pin or VDD
Two comparators
   - Programmable hysteresis
   - Configurable to generate interrupts or reset
VDD Monitor and Brown-out Detector
On-Chip JTAG Debug
   - On-chip emulation circuitry facilitates full-speed, non-intrusive, in-circuit emulation
   - Supports breakpoints, single stepping, watchpoints, inspect/modify memory, and registers
   - Superior performance to emulation systems using ICE-chips, target pods, and sockets
   - Fully compliant with IEEE 1149.1 specification
Supply Voltage: 2.7 to 3.6 V
   - Typical operating current: 9 mA at 25 MHz
   - Typical stop mode current: <0.1 uA
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 system clock
   - Expanded interrupt handler; up to 21 interrupt sources Memory
   - 256 bytes data RAM
   - 8 kB Flash; in-system programmable in 512 byte sectors (512 bytes are reserved)
Digital Peripherals
   - 22 port I/O; all are 5 V tolerant
   - Hardware SPI™ and UART serial ports available concurrently
   - 3 general-purpose 16-bit counter/timers
   - Dedicated watchdog timer; bidirectional reset
Clock Sources
   - Internal programmable oscillator: 2–16 MHz
   - External oscillator: Crystal, RC, C, or Clock
   - Can switch between clock sources on-the-fly
Package
   - 32-pin LQFP (standard lead and lead-free packages)
Ordering Part Numbers
   - Lead-free package: C8051F221-GQ
   - Standard package: C8051F221