68hc12

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carlosthejackle2001

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Can I connect the amplifier straight to the input of the 68hc12? If I do will it damage it or will it be fine?

The amplifier will be single rail of +5v
 

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I suggest you add a series resistor to limit the current, just in case the pin should get set as an output!.
 
Nigel Goodwin said:
I suggest you add a series resistor to limit the current, just in case the pin should get set as an output!.
Click to expand...

I think as soon as it's turned on it's an output before the code instructs the port to become an input... I think

Will a resistor of few KOhms be fine or should this current be measured and resistor judged accordingly? I don't have immediate access till midway through next week which is a pain
 
[quote="carlosthejackle2001]I think as soon as it's turned on it's an output before the code instructs the port to become an input... I think

Will a resistor of few KOhms be fine or should this current be measured and resistor judged accordingly? I don't have immediate access till midway through next week which is a pain[/quote]

~1K will do.
 
carlosthejackle2001 said:
I think as soon as it's turned on it's an output before the code instructs the port to become an input... I think
Click to expand...

That would be rather a stupid design! - PIC's are inputs by default, and you have to set them to be an output. I can't imagine any manufacturer doing it the other way round?.
 
Nigel Goodwin said:
That would be rather a stupid design! - PIC's are inputs by default, and you have to set them to be an output. I can't imagine any manufacturer doing it the other way round?.
Click to expand...

hmm..in atmel 89 series (atleast in 89s52/89s8252) u have to write 1 to the port for it to become i/p, otherwise it is output by default afaik..
 
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