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8051 microcontrollers Available as word document for downloading at the end of the post   8051 microcontrollers This microcontroller is also called as “System on a chip” because it has all the features on a single chip. The Block Diagram of 8051 Microcontroller is as shown in Figure                                   Image  credit : EngineersGarage It use two different kinds of memory such as UV- EPROM, Flash and NV-RAM. Hence 8051 will not be seen in the part number even though it is the most popular member of the 8051 family AT89C51 (Variant of 8051 microcontroller) from Atmel Corporation 1 (‘C’ in the part number indicates  CMOS ). The flash memory can erase the contents within seconds which is best for fast growth. Therefore, 8751 is replaced by AT89C51 to eradicate the waiting time required to erase the contents and hence expedite the development time. To build up a microcontroller based system using AT89C51, it is essential to have ROM burner that supports flash memory. Note tha