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umm 1? lol No, seriously, as explained on www.8052.com, the 8052 has twice the RAM of the 8051 (that is 256 Bytes), an additional 16-bit Timer (Timer 2) and more Special Function Registers (SFR) as required for the additional features. The most essential difference is that Timer2 can be used as a Baud rate generator for serial communication.
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RossInstruction set, Internal memory structure and Pinout are the same. 8951 Controllers which are faster and more complex were first developed in the 90's as an improvement to the 8051.
Many 8951 controllers have 2, 4 or 6 clock cores as opposed to 12. Whats more many provide onboard DAC, ADC, I2C, USB, CAN etc
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What is the difference between 8051 pic controllers and arm7 lpc2148?
architecture
Who is first invented 8051 microcontroller or 8051 microprocessor?
Intel
Difference between 8031 8051 and 8751 microcontrollers?
Answer It is both 8 bit processors in a 40 pin package but it is not pin compatible, it have almost the same functions but it is very difficult to compare the two because it is not the same family.
Interface of ADC0808 with AT89S52?
check this link http://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/Interfacing-ADC0808-To-8051.html
What is the external data memory capacity of 8051 and why?
65536 bytes, because the 8051 family has a 16 bit external address buss.
