AT89LP2052-20PU

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 Atmel's 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. In the AT89LP2052/LP4052 CPU, instructions need only 1 to 4 clock cycles providing 6 to 12 times more throughput than the standard 8051. Seventy percent of instructions need only as many clock cycles as they have bytes to execute, and most of the remaining instructions require only one additional clock. The enhanced CPU core is capable of 20 MIPS throughput whereas the classic 8051 CPU can deliver only 4 MIPS at the same current consumption. Conversely, at the same throughput as the classic 8051, the new CPU core runs at a much lower speed and thereby greatly reduces power consumption. The two timer/counters in the AT89LP2052/LP4052 are enhanced with two new modes. Mode 0 can be configured as a variable 9- to 16-bit timer/counter and Mode 1 can be configured as a 16-bit auto-reload timer/counter. In addition both timer/counters may be configured as 8-bit Pulse Width Modulators with 8-bit prescalers. The I/O ports of the AT89LP2052/LP4052 can be independently configured in one of four operating modes. In quasi-bidirectional mode, the ports operate as in the classic 8051. In input mode, the ports are tri-stated. Push-pull output mode provides full CMOS drivers and open-drain mode provides just a pull-down. The AT89LP2052/LP4052 uses a Harvard Architecture with separate address spaces for program and data memory. The program memory has a regular linear address space with support for up to 64K bytes of directly addressable application code. The data memory has 256 bytes of internal RAM which is divided into regions that may be accessed by different instruction classes. The AT89LP2052/LP4052 does not support external RAM. The AT89LP2052/LP4052 contains 2/4K bytes of on-chip In-System Programmable Flash memory for program storage. The Flash memory has an endurance of at least 10,000 write/erase cycles. The reset and interrupt vectors are located within the first 59 bytes of program memory. Constant tables can be allocated within the entire 2/4-Kbyte program memory address space for access by the MOVC instruction. The AT89LP2052/LP4052 contains 256 bytes of general SRAM data memory plus 128 bytes of I/O memory. The lower 128 bytes of data memory may be accessed through both direct and indirect addressing. The upper 128 bytes of data memory and the 128 bytes of I/O memory share the same address space. The upper 128 bytes of data memory may only be accessed using indirect addressing. The I/O memory can only be accessed through direct addressing and contains the Special Function Registers (SFRs). The lowest 32 bytes of data memory are grouped into 4 banks of 8 registers each. The RS0 and RS1 bits (PSW.3 and PSW.4) select which register bank is in use. Instructions using register addressing will only access the currently specified bank. The AT89LP2052/LP4052 does not support external data memory. The AT89LP2052/LP4052 is part of a family of devices with enhanced features that are fully binary compatible with the MCS-51 instruction set. In addition, most SFR addresses, bit assignments, and pin alternate functions are identical to Atmel's existing standard 8051 products.

Key features

• Compatible with MCS-51 Products
• 20 MIPS Throughput at 20 MHz Clock Frequency and 2.4V, 85℃ 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 Operating Range
• Fully Static Operation: 0 Hz to 20 MHz
• 2-level Program Memory Lock
• ±256×8 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