The 8051 microcontroller is basically a tiny computer in a chip, it comes in different variety nowadays initially developed by Intel in the 80's. The 8051 family is also known as MCS-51 family. In my page, I will be using the AT89S52 from Atmel.
The AT89S52 features a 8KB flash memory, 256 bytes internal RAM, clock support up to 33MHz, 32 I/O lines, full duplex serial port, three 16 bit timers, eight interrupts sources and In-System Programmable and 12 clock architecture, other newer 8051 derivatives are enhanced that instructions run in 1 clock cycle.
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