8051

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128 bytes on-chip data memory (RAM)

Four register banks

128 user defined software flags

8-bit bidirectional data bus

16-bit unidirectional address bus

32 general purpose registers each of 8-bit

16 bit Timers (usually 2, but may have more or less)

Three internal and two external Interrupts

Four 8-bit ports,(short model have two 8-bit ports)

16-bit program counter and data pointer

8051 may also have a number of special features such as UARTs, ADC, Op-amp, etc.

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