AT89C51RB2-3CSUM

The AT89C51RB2 is a high-performance Flash version of the 80C51 8-bit microcontrollers. It contains a 16K or 32K Bytes Flash memory block for program and data. The Flash memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. The programming voltage is internally generated from the standard VCC pin. The AT89C51RB2 retains all features of the 80C52 with 256 Bytes of internal RAM, a 9-source 4-level interrupt controller and three timer/counters. In addition, the AT89C51RB2 has a Programmable Counter Array, an XRAM of 1024 Bytes, a Hardware Watchdog Timer, a Keyboard Interface, an SPI Interface, a more versatile serial channel that facilitates multiprocessor communication (EUART) and a speed improvement mechanism (X2 mode). The Pinout is the standard 40/44 pins of the C52. The fully static design reduces system power consumption of the AT89C51RB2 by allowing it to bring the clock frequency down to any value, even DC, without loss of data. The AT89C51RB2 has 2 software-selectable modes of reduced activity and 8-bit clock prescaler for further reduction in power consumption. In Idle mode, the CPU is frozen while the peripherals and the interrupt system are still operating. In power-down mode, the RAM is saved and all other functions are inoperative. The added features of the AT89C51RB2 make it more powerful for applications that need pulse width modulation, high speed I/O and counting capabilities such as alarms, motor control, corded phones, and smart card readers.

• 80C52 Compatible
  • 8051 Pin and Instruction Compatible
  • Four 8-bit I/O Ports
  • Three 16-bit Timer/Counters
  • 256 Bytes Scratch Pad RAM
  • 9 Interrupt Sources with 4 Priority Levels
  • Dual Data Pointer
• Variable Length MOVX for Slow RAM/Peripherals
• ISP (In-system Programming) Using Standard VCC Power Supply
• Boot ROM Contains Low Level Flash Programming Routines and a Default Serial Loader
• High-speed Architecture
  • In Standard Mode: 40 MHz (Vcc 2.7V to 5.5V, both Internal and external code execution) 60 MHz (Vcc 4.5V to 5.5V and Internal Code execution only)
  • In X2 mode (6 Clocks/machine cycle) 20 MHz (Vcc 2.7V to 5.5V, both Internal and external code execution) 30 MHz (Vcc 4.5V to 5.5V and Internal Code execution only)
  • 16K/32K Bytes On-chip Flash Program/Data Memory
  • Byte and Page (128 Bytes) Erase and Write
  • 100K Write Cycles
• On-chip 1024 Bytes Expan