Features：

• 8-bit Microcontroller Compatible with MCS®51 Products

• Enhanced 8051 Architecture

– Single-clock Cycle per Byte Fetch

– Up to 20 MIPS Throughput at 20 MHz Clock Frequency

– Fully Static Operation: 0 Hz to 20 MHz

– On-chip 2-cycle Hardware Multiplier

– 256 x 8 Internal RAM

– 512 x 8 Internal Extra RAM

– Dual Data Pointers

– 4-level Interrupt Priority

• Nonvolatile Program and Data Memory

– 4K/8K Bytes of In-System Programmable (ISP) Flash Program Memory

– 512/1024 Bytes of Flash Data Memory

– Endurance: Minimum 100,000 Write/Erase Cycles (for BothProgram/Data Memories)

– Serial Interface for Program Downloading

– 64-byte Fast Page Programming Mode

– 128-byte User Signature Array

– 2-level Program Memory Lock for Software Security

– In-Application Programming of Program Memory

• Peripheral Features

– Three 16-bit Enhanced Timer/Counters

– Two 8-bit PWM Outputs

– 4-channel 16-bit Compare/Capture/PWM Array

– Enhanced UART with Automatic Address Recognition and FramingError Detection

– Enhanced Master/Slave SPI with Double-buffered Send/Receive

– Programmable Watchdog Timer with Software Reset

– Dual Analog Comparators with Selectable Interrupts and Debouncing

– 8 General-purpose Interrupt Pins

• Special Microcontroller Features

– 2-wire On-chip Debug Interface

– Brown-out Detection and Power-on Reset with Power-off Flag

– Active-low External Reset Pin

– Internal RC Oscillator

– Low Power Idle and Power-down Modes

– Interrupt Recovery from Power-down Mode

• I/O and Packages

– Up to 30 Programmable I/O Lines

– 28-lead PDIP or 32-lead TQFP/PLCC/MLF

– Configurable I/O Modes

• Quasi-bidirectional (80C51 Style)

• Input-only (Tristate)

• Push-pull CMOS Output

• Open-drain

• Operating Conditions

– 2.4V to 5.5V VCC Voltage Range

– -40°C to 85°C Temperature Range

– 0 to 20 MHz @ 2.4–5.5V

– 0 to 25 MHz @ 4.0–5.5V