Wednesday, April 29, 2009


A single chip of microcontroller is obtained by integrating all components of a microcomputer in one IC package. Hence it will contain its own clock generator, ROM or EEPROM, RAM and I/O parts with some additional features like timer/counter. It can act as master as well as slave. It is more reliable and cost is less. For the memory and the less cost we are using P89V51RD2 controller.

The P89V51RD2 is an 80C51 microcontroller with 64 kB Flash and 1024 bytes of data RAM.A key feature of the P89V51RD2 is its X2 mode option. The design engineer can choose to run the application with the conventional 80C51 clock rate (12 clocks per machine cycle) or select the X2 mode (6 clocks per machine cycle) to achieve twice the throughput at the same clock frequency. Another way to benefit from this feature is to keep the same performance by reducing the clock frequency by half, thus dramatically reducing the EMI

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