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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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15y ago
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14y ago

Instruction 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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Q: What is difference between 8051 and 8951?
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