Q: What is the function of at89c51?

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Not every relation is a function. But every function is a relation. Function is just a part of relation.

The cubic function.

Range

The Mandelbrot graph is generated iteratively and so is a function of a function of a function ... and in that sense it is a composite function.

A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.

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AT89C51 function

can we replace AT89c51 by AT89s52 but i have c51 code

AT89C51 can have a maximum of 6.6v as input voltage

CMOS

yes both are same

No.....You have to program it and upload in the microcontroller

it is a microcontoller ( a version of 8051) At denotes ATMEL company C stands for CMOS 9 stands for flash memory

working voltage is 5v regulated dc

It gives the possibility to generate several precise baudrates for serial communications. With 12 MHz you introduce small errors that will however be acceptable for hobbyists.

Atmel posts the datasheet for their AT89C51 and other microcontrollers on their website (see link below). That datasheet specifies that the Atmel AT89C51 is operational for an oscillators in the range 24 MHz to 0 Hz (fully static paused). However, during initial flash programming and verification, it requires an oscillator frequency in the range 24 MHz to 3 MHz. That datasheet also answers many other questions you might have about this microcontroller.

You'll need to acquire a programmer board and the application software. The programmer boards typically plug into your PC and you can write an application using the application software, then you can load the application into the microcontroller using the programmer board.

89c51 microcontroller is of the series of 8051,one of oldest yet commonly used microcontroller.89c51 have the less complex features then other microcontroller and it is also easily available and cheap in comparison of other microcontrollers.