What is ISP???

hi,
what is In-system Programming Port???
why do we use the isp port???
Which is the difference of use between serial port and isp in a microcontroller system???
is it necessary in a microcontroller system???
Also i would like to ask if a multiplexer is a good idea to increase the number of analog inputs of a microcontroller.
thanks !!!

To my PIC16F876 project i use 4051/ph analog multiplexer, it's very simple to use!!

auto_mitch said:

hi,
what is In-system Programming Port???
why do we use the isp port???

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It allows the microcontroller to be re-programmed without having to remove it from the circuit board.

auto_mitch said:

is it necessary in a microcontroller system???

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No, But if you don't implement it in your circuit board you will have to remove the controller from its board and place it into your programmer every time you want to change its program. (impossible when using SMD devices)

auto_mitch said:

Also i would like to ask if a multiplexer is a good idea to increase the number of analog inputs of a microcontroller.

Click to expand...

Yes, an analog multiplexer should do fine. A 4051 for example multiplexes 8 lines to 1 and works great.