AT89C51RB2-3CSIM [Microchip]

The AT89C51RB2/RC2 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 device 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, it 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 (EUART) and a speed improvement mechanism (X2 mode). The fully static design reduces system power consumption by allowing it to bring the clock frequency down to any value, even DC, without loss of data. The added features make it more powerful for applications that need pulse width modulation, high speed I/O and counting capabilities.