Description
The AT89LP2052/LP4052 is a low-power, high-performance CMOS 8-bit microcontroller with 2/4K bytes of In-System Programmable Flash memory. The device is manufactured using Atmels high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set. The AT89LP2052/LP4052 is built around an enhanced CPU core that can fetch a single byte from memory every clock cycle. In the classic 8051 architecture, each fetch required 6 clock cycles, forcing instructions to execute in 12, 24 or 48 clock cycles.

Features
• Compatible with MCS®51 Products
• 20 MIPS Throughput at 20 MHz Clock Frequency and 2.4V, 85°C Operating Conditions
• Single Clock Cycle per Byte Fetch
• 2/4K Bytes of In-System Programmable (ISP) Flash Memory
   – Serial Interface for Program Downloading
   – 32-byte Fast Page Programming Mode
   – 32-byte User Signature Array
• 2.4V to 5.5V VCC Operating Range
• Fully Static Operation: 0 Hz to 20 MHz
• 2-level Program Memory Lock
• 256 x 8 Internal RAM
• Hardware Multiplier
• 15 Programmable I/O Lines
• Configurable I/O with Quasi-bidirectional, Input, Push-pull Output, and
   Open-drain Modes
• Enhanced UART with Automatic Address Recognition and Framing Error Detection
• Enhanced SPI with Double-buffered Send/Receive
• Programmable Watchdog Timer with Software Reset
• 4-level Interrupt Priority
• Analog Comparator with Selectable Interrupt and Debouncing
• Two 16-bit Enhanced Timer/Counters with 8-bit PWM
• Brown-out Detector and Power-off Flag
• Internal Power-on Reset
• Low Power Idle and Power-down Modes
• Interrupt Recovery from Power-down Mode