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![]() Brief History of 8051
The first microprocessor 4004 was invented by Intel Corporation. 8085 and 8086 microprocessors were also invented by Intel. In 1981, Intel introduced an 8-bit microcontroller called the 8051. It was referred as system on a chip because it had 128 bytes of RAM, 4K byte of on-chip ROM, two timers, one serial port, and 4 ports (8-bit wide), all on a single chip. When it became widely popular, Intel allowed other manufacturers to make and market different flavors of 8051 with its code compatible with 8051. It means that if you write your program for one flavor of 8051, it will run on other flavors too, regardless of the manufacturer. This has led to several versions with different speeds and amounts of on-chip RAM.
8051 Flavors / Members
Comparison between 8051 Family Members
The following table compares the features available in 8051, 8052, and 8031.
Features of 8051 Microcontroller
An 8051 microcontroller comes bundled with the following features −
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Block Diagram of 8051 Microcontroller
The following illustration shows the block diagram of an 8051 microcontroller −
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