In 51 MCU, 8051 series chips are usually used. According to the common 8051 series chip pin definition, there are no chips with more than 80 pins. Under normal circumstances, the number of pins of the 8051 series chips is between 20 and 44.
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However, it is important to note that the 8051 series chips are available in several different models and packages, and each model and package may have a different number of pins. Therefore, the specific chip model and package type will directly affect the number of pins of the chip.
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If you have identified a specific 51 microcontroller model, you can consult the relevant chip manual or data manual for detailed pin definitions and quantities. This will give you the exact information you need.
51 microcontroller is an entry-level 8-bit microcontroller, and there are currently no microcontroller chips with pins over 80.