Описание
The AT89LP51RD2 is a low-power, high-performance CMOS 8-bit 8051 microcontroller with 64KB of In-System Programmable Flash program memory. The devices are manufactured using high-density nonvolatile memory technology and are compatible with the industry-standard 80C51 instruction set.The AT89LP51RD2 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 requires 6 clock cycles, forcing instructions to execute in 12, 24 or 48 clock cycles. In the AT89LP51RD2 CPU, standard instructions need only one to four clock cycles providing six to twelve 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 reducing power consumption and EMI. The AT89LP51RD2 also includes a compatibility mode that will enable classic 12 clock per machine cycle operation for true timing compatibility with the AT89C51RD2.The AT89LP51RD2 features including: 64KB of In-System Programmable Flash program memory, 256 bytes of RAM, 2KB of expanded RAM, up to 40 I/O lines, three 16-bit timer/counters, a Programmable Counter Array, a programmable hardware watchdog timer, a keyboard interface, a full-duplex enhanced serial port, a serial peripheral interface (SPI), on-chip crystal oscillator, and a four-level, ten-vector interrupt system.The AT89LP51RD2 provides a Two-Wire Interface (TWI) for up to 400KB/s serial transfer; a 10-bit, 8-channel Analog-to-Digital Converter (ADC) with temperature sensor and digital-to-analog (DAC) mode; two analog comparators; an 8MHz internal oscillator; and more on-chip data memory.The AT89LP51RD2 are enhanced with new modes or operations. Mode 0 of Timer 0 or Timer 1 acts as a variable 9–16 bit timer/counter and Mode 1 acts as a 16-bit auto-reload timer/counter. In addition, each timer/counter may independently drive an 8-bit precision pulse width modulation output. Mode 0 (synchronous mode) of the serial port allows flexibility in the phase/polarity relationship between clock and data.The I/O ports of the AT89LP51RD2 can be independently configured in one of four operating modes. In quasi-bidirectional mode, the ports operate as in the classic 8051. In input only mode, the ports are tri-stated. Push-pull output mode provides full CMOS drivers and open drain mode provides just a pull-down. Unlike other 8051s, this allows Port 0 to operate with on-chip pull-ups if desired.The AT89LP51RD2 includes an On-Chip Debug (OCD) interface that allows read modify-write capabilities of the system state and program flow control, and programming of the internal memories. The on-chip Flash and EEPROM may also be programmed through the UART-based bootloader or the SPI-based In-System programming interface (ISP).
- 8-bit Microcontroller Compatible with 8051 Products
- Enhanced 8051 Architecture
- Single Clock Cycle per Byte Fetch
- 12 Clock per Machine Cycle Compatibility Mode
- Up to 20 MIPS Throughput at 20 MHz Clock Frequency
- Fully Static Operation: 0 Hz to 20 MHz
- On-chip 2-cycle Hardware Multiplier
- 16×16 Multiply–Accumulate Unit
- 256 x 8 Internal RAM
- On-chip 2KB Expanded RAM (ERAM)
- Software Selectable Size (0, 256, 512, 768, 1024, 1792, 2048 Bytes)
- Dual Data Pointers
- 4-level Interrupt Priority
- Nonvolatile Program and Data Memory
- 64KB of In-System Programmable (ISP) Flash Program Memory
- 4KB of EEPROM (AT89LP51ED2/ID2 Only)
- 512-byte User Signature Array
- Endurance: 10,000 Write/Erase Cycles
- Serial Interface for Program Downloading
- 2KB Boot ROM Contains Low Level Flash Programming Routines and a Default Serial Bootloader
- Peripheral Features
- Three 16-bit Enhanced Timer/Counters
- Seven 8-bit PWM Outputs
- 16-bit Programmable Counter Array
- High Speed Output, Compare/Capture
- Pulse Width Modulation, Watchdog Timer Capabilities
- Enhanced UART with Automatic Address Recognition and Framing Error Detection
- Enhanced Master/Slave SPI with Double-buffered Send/Receive
- Two Wire Interface 400K bit/s
- Programmable Watchdog Timer with Software Reset
- 8 General-purpose Interrupt and Keyboard Interface Pins
- Special Microcontroller Features
- Dual Oscillator Support: Crystal, 32 kHz Crystal, 8 MHz Internal (AT89LP51ID2)
- Two-wire On-Chip Debug Interface
- Brown-out Detection and Power-on Reset with Power-off Flag
- Selectable Polarity External Reset Pin
- Low Power Idle and Power-down Modes
- Interrupt Recovery from Power-down Mode
- 8-bit Clock Prescaler
- I/O and Packages
- Up to 40 Programmable I/O Lines
- Green (Pb/Halide-free) PLCC44, VQFP44, QFN44, PDIP40
- 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 @ 2.4V–5.5V (Single-cycle)
