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microcontroller 8051 o/p when pin goes high & programming

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indianhits

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hello guys i have a question.


i assume that the MAX. input voltage is 5V and MAX input current is 50mA.Am i correct????

when a uC pin goes high what will be the voltage across it and also current????

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Now i am communicating with serial port RS-232 so i must create a driver or program that will get data from buffer and copy the data to a text file.so programming that in DOS or Windows is easy????

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and does any of the Atmel series of Microcontroller(8051) has an analog to digital converter(ADC) internal


Please help me.Thanks!
 
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8051 is keeping it general, be more precise.

For the 89C51 the pin current is 20ma and the voltage is 5+.5(max).

Well TI does have a 8051 variation, but it is not prototype friendly

Data Converters - MicroSystem Mixed-Signal Data Converters - MSC1210Y5 - TI.com

If you want to use an A2D module, move on to AVRs or PICs. For the serial part, yes you will need a serial line driver (MAX232 is most common). Google it and you will see how.
 
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